1987
20.
Y Maeno, T Nojima, Y Aoki, M Kato, K Hoshino, A Minami, T Fujita
Superconductivity in YBa2Cu3-yNiyO7-δ Journal Article
In: Japanese Journal of Applied Physics, vol. 26, no. 5A, pp. L774-L776, 1987.
@article{Maeno1987L774,
title = {Superconductivity in YBa2Cu3-yNiyO7-δ},
author = {Y Maeno and T Nojima and Y Aoki and M Kato and K Hoshino and A Minami and T Fujita},
doi = {10.1143/JJAP.26.L774},
year = {1987},
date = {1987-01-01},
journal = {Japanese Journal of Applied Physics},
volume = {26},
number = {5A},
pages = {L774-L776},
abstract = {Superconductivity in alloyed compounds YBa2Cu3-yNiyO7-δ has been studied in order to gain direct insights on the roles different Cu sites play in electrical conduction. Electron probe microanalysis as well as X-ray powder diffraction analysis shows that Ni is actually substituted for Cu in the oxygen-deficient perovskite compound for y at least as much as 0.27. Electrical resistivity measurements revealed that the substituted Ni does not substantially destroy the superconductivity. © 1987 IOP Publishing Ltd.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Superconductivity in alloyed compounds YBa2Cu3-yNiyO7-δ has been studied in order to gain direct insights on the roles different Cu sites play in electrical conduction. Electron probe microanalysis as well as X-ray powder diffraction analysis shows that Ni is actually substituted for Cu in the oxygen-deficient perovskite compound for y at least as much as 0.27. Electrical resistivity measurements revealed that the substituted Ni does not substantially destroy the superconductivity. © 1987 IOP Publishing Ltd.
19.
Y Maeno, T Tomita, M Kyogoku, S Awaji, Y Aoki, K Hoshino, A Minami, T Fujita
Substitution for copper in a high-Tc superconductor YBa 2Cu3O7-δ Journal Article
In: Nature, vol. 328, no. 6130, pp. 512-514, 1987.
@article{Maeno1987512,
title = {Substitution for copper in a high-Tc superconductor YBa 2Cu3O7-δ},
author = {Y Maeno and T Tomita and M Kyogoku and S Awaji and Y Aoki and K Hoshino and A Minami and T Fujita},
doi = {10.1038/328512a0},
year = {1987},
date = {1987-01-01},
journal = {Nature},
volume = {328},
number = {6130},
pages = {512-514},
abstract = {In spite of an overwhelming amount of research work1 triggered by the discovery2 of superconductivity above 90 K in an Y-Ba-Cu oxide, fundamental questions regarding the origin and mechanism of the high-Tc superconductivity in YBa2Cu3O 7-δ remain to be answered. Specifically, it has not been decided which of the two Cu sites mainly carries superconducting electrons. As an approach to the problem, we investigated superconductivity in a series of alloyed compounds, YBa2 (Cu1-xMx) 3O7-δ with M = Fe, Co, Ni, Zn and Ga, in which metals M are partially substituted for Cu. The electrical resistivity measurements, as well as the X-ray analysis at low temperatures, show that Tc is not sensitive to the orthorhombic-tetragonal phase transition induced by the impurities, thus strongly suggesting that superconductivity along the one-dimensional Cu-O chains is unlikely. © 1987 Nature Publishing Group.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In spite of an overwhelming amount of research work1 triggered by the discovery2 of superconductivity above 90 K in an Y-Ba-Cu oxide, fundamental questions regarding the origin and mechanism of the high-Tc superconductivity in YBa2Cu3O 7-δ remain to be answered. Specifically, it has not been decided which of the two Cu sites mainly carries superconducting electrons. As an approach to the problem, we investigated superconductivity in a series of alloyed compounds, YBa2 (Cu1-xMx) 3O7-δ with M = Fe, Co, Ni, Zn and Ga, in which metals M are partially substituted for Cu. The electrical resistivity measurements, as well as the X-ray analysis at low temperatures, show that Tc is not sensitive to the orthorhombic-tetragonal phase transition induced by the impurities, thus strongly suggesting that superconductivity along the one-dimensional Cu-O chains is unlikely. © 1987 Nature Publishing Group.
18.
H Fujii, Y Uwatoko, M Akayama, K Satoh, Y Maeno, T Fujita, T Fujita, J Sakurai, H Kamimura
Magnetic and transport properties of new kondo compounds cetin (t=ni, pd and pt) Journal Article
In: Japanese Journal of Applied Physics, vol. 26, no. S3-1, pp. 549-550, 1987.
@article{Fujii1987549,
title = {Magnetic and transport properties of new kondo compounds cetin (t=ni, pd and pt)},
author = {H Fujii and Y Uwatoko and M Akayama and K Satoh and Y Maeno and T Fujita and T Fujita and J Sakurai and H Kamimura},
doi = {10.7567/JJAPS.26S3.549},
year = {1987},
date = {1987-01-01},
journal = {Japanese Journal of Applied Physics},
volume = {26},
number = {S3-1},
pages = {549-550},
abstract = {Measurements of magnetic susceptibility, electrical resistivity and thermoelectric power have been made on the CeTIn system (T=Ni, Pd and Pt) with the hexagonal Fe2P-type structure. The results suggest that CeNiIn is an intermediate valence compound with Kondo-like anomalies in resistivity ρm(T), and CePdIn is a heavy fermion compound with doubie-peak structures in both ρm(T) and S(T) and exhibits an antiferromagnetic order at TN=1.8 K, whereas CePtIn is a heavy fermion peak in ρm(T) and shows no magnetic and superconducting transitions. © 1987 The Japan Society of Applied Physics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Measurements of magnetic susceptibility, electrical resistivity and thermoelectric power have been made on the CeTIn system (T=Ni, Pd and Pt) with the hexagonal Fe2P-type structure. The results suggest that CeNiIn is an intermediate valence compound with Kondo-like anomalies in resistivity ρm(T), and CePdIn is a heavy fermion compound with doubie-peak structures in both ρm(T) and S(T) and exhibits an antiferromagnetic order at TN=1.8 K, whereas CePtIn is a heavy fermion peak in ρm(T) and shows no magnetic and superconducting transitions. © 1987 The Japan Society of Applied Physics.
17.
T Fujita, Y Aoki, Y Maeno, J Sakurai, H Fukuba, H Fujii, T Okamoto, K Kumagai, M Kurisu, H Kadomatsu, H Fujiwara
High-Tc Superconductivity and Phase Diagram of (La1-xBax)2CuO4-y Journal Article
In: Japanese Journal of Applied Physics, vol. 26, no. S3-2, pp. 1041-1042, 1987.
@article{Fujita19871041,
title = {High-Tc Superconductivity and Phase Diagram of (La1-xBax)2CuO4-y},
author = {T Fujita and Y Aoki and Y Maeno and J Sakurai and H Fukuba and H Fujii and T Okamoto and K Kumagai and M Kurisu and H Kadomatsu and H Fujiwara},
doi = {10.7567/JJAPS.26S3.1041},
year = {1987},
date = {1987-01-01},
journal = {Japanese Journal of Applied Physics},
volume = {26},
number = {S3-2},
pages = {1041-1042},
abstract = {The lattice, magnetic and superconducting properties of the oxides, (La1-xMx)2CuO4-y (M=Ba, Ca), were extensively investigated as a function of both temperature T and Ba-concentration x. For x > 0.025 the compounds show a superconducting transition, with which two different types of phase transitions were found to compete in the T-x plane; crystal distortion from a tetragonal to an orthorhombic lattice and antiferromagnetic ordering. External hydrostatic pressure tends to depress the magnetic ordering and to enhance superconductivity. © 1987 The Japan Society of Applied Physics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The lattice, magnetic and superconducting properties of the oxides, (La1-xMx)2CuO4-y (M=Ba, Ca), were extensively investigated as a function of both temperature T and Ba-concentration x. For x > 0.025 the compounds show a superconducting transition, with which two different types of phase transitions were found to compete in the T-x plane; crystal distortion from a tetragonal to an orthorhombic lattice and antiferromagnetic ordering. External hydrostatic pressure tends to depress the magnetic ordering and to enhance superconductivity. © 1987 The Japan Society of Applied Physics.
16.
Y Kitano, K Kifune, I Mukouda, H Kamimura, J Sakurai, Y Komura, K Hoshino, M Suzuki, A Minami, Y Maeno, M Kato, T Fujita
Analysis of crystal structure of an Y-Ba-Cu oxide Journal Article
In: Japanese Journal of Applied Physics, vol. 26, no. 4 A, pp. L394-L396, 1987.
@article{Kitano1987L394,
title = {Analysis of crystal structure of an Y-Ba-Cu oxide},
author = {Y Kitano and K Kifune and I Mukouda and H Kamimura and J Sakurai and Y Komura and K Hoshino and M Suzuki and A Minami and Y Maeno and M Kato and T Fujita},
doi = {10.1143/JJAP.26.L394},
year = {1987},
date = {1987-01-01},
journal = {Japanese Journal of Applied Physics},
volume = {26},
number = {4 A},
pages = {L394-L396},
abstract = {Results of the analyses on crystal structure and chemical composition of dark-green crystals mainly found in an Y-Ba-Cu oxide specimen which shows highc superconductivity are reported. Crystal structure is investigated by the electron diffraction method and is determined to be orthorhombic with lattice parameters =1.22 nm, =0.561 nm and =0.714nm, and with a space group Pnma (No. 62) or Pna21 (No. 33). Expected -values are presented and are successfully compared with the X-ray powder diffraction spectrum obtained from this oxide. Chemical composition is analyzed by the EPMA method and is determined to be Y2BaCuO5 for the oxide. © 1987 IOP Publishing Ltd.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Results of the analyses on crystal structure and chemical composition of dark-green crystals mainly found in an Y-Ba-Cu oxide specimen which shows highc superconductivity are reported. Crystal structure is investigated by the electron diffraction method and is determined to be orthorhombic with lattice parameters =1.22 nm, =0.561 nm and =0.714nm, and with a space group Pnma (No. 62) or Pna21 (No. 33). Expected -values are presented and are successfully compared with the X-ray powder diffraction spectrum obtained from this oxide. Chemical composition is analyzed by the EPMA method and is determined to be Y2BaCuO5 for the oxide. © 1987 IOP Publishing Ltd.
1986
15.
R E Ecke, H Haucke, Y Maeno, J C Wheatley
Critical dynamics at a Hopf bifurcation to oscillatory Rayleigh- Bénard convection Journal Article
In: Physical Review A, vol. 33, no. 3, pp. 1870-1878, 1986.
@article{Ecke19861870,
title = {Critical dynamics at a Hopf bifurcation to oscillatory Rayleigh- Bénard convection},
author = {R E Ecke and H Haucke and Y Maeno and J C Wheatley},
doi = {10.1103/PhysRevA.33.1870},
year = {1986},
date = {1986-01-01},
journal = {Physical Review A},
volume = {33},
number = {3},
pages = {1870-1878},
abstract = {The steady-state and dynamic properties of the transition to oscillatory convection in a low-Prandtl-number fluid, dilute He3 in superfluid He4, are presented. Critical slowing down is observed and characterized by a phenomenological Landau-Hopf equation in analogy with equilibrium mean-field critical phenomena. In contrast to the onset of classical time-independent Rayleigh-Bénard convection, where appreciable rounding is typically observed, there is no measurable rounding at the oscillatory onset down to a reduced Rayleigh number of 3×10-4. Possible reasons for this are discussed. Different functional singularities are observed for the rms amplitudes of the fundamental and first harmonic spectral components of the oscillation. Finally, the Prandtl-number dependence of the parameters of the dynamics is presented. © 1986 The American Physical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The steady-state and dynamic properties of the transition to oscillatory convection in a low-Prandtl-number fluid, dilute He3 in superfluid He4, are presented. Critical slowing down is observed and characterized by a phenomenological Landau-Hopf equation in analogy with equilibrium mean-field critical phenomena. In contrast to the onset of classical time-independent Rayleigh-Bénard convection, where appreciable rounding is typically observed, there is no measurable rounding at the oscillatory onset down to a reduced Rayleigh number of 3×10-4. Possible reasons for this are discussed. Different functional singularities are observed for the rms amplitudes of the fundamental and first harmonic spectral components of the oscillation. Finally, the Prandtl-number dependence of the parameters of the dynamics is presented. © 1986 The American Physical Society.
1985
14.
Y Maeno, H Haucke, R E Ecke, J C Wheatley
Oscillatory convection in a dilute3He-superfluid4He solution Journal Article
In: Journal of Low Temperature Physics, vol. 59, no. 3-4, pp. 305-345, 1985.
@article{Maeno1985305,
title = {Oscillatory convection in a dilute3He-superfluid4He solution},
author = {Y Maeno and H Haucke and R E Ecke and J C Wheatley},
doi = {10.1007/BF00683781},
year = {1985},
date = {1985-01-01},
journal = {Journal of Low Temperature Physics},
volume = {59},
number = {3-4},
pages = {305-345},
abstract = {Convective instabilities in a rectangular, unity-aspect-ratio Rayleigh-Bénard cell with a solution of 1.46%3He in superfluid4He have been studied in the temperature range 0.70-1.05 K, with a corresponding Prandtl number range of 0.045<σ<0.15. The onset of stationary convection is much like that in a classical, one-component fluid. The oscillatory instability is studied by using an extremely sensitive local temperature probe. It is found that the total heat transport efficiency is suppressed by the oscillations in the entire range of Prandtl number we have studied. The local temperature probe indicates a striking difference in the oscillatory amplitude when the sense of rotation of the convective rolls is reversed. The magnitude of the convective velocity is deduced from both the initial slope of the Nusselt number near the onset of the stationary convection and the frequency of the oscillations. Determinations of the temperature dependence of the convective velocity using these two methods agree very well. The observed behavior of the oscillatory frequency and onset condition supports the theory of oscillatory convection for a classical, low-Prandtl-number, one-component fluid. © 1985 Plenum Publishing Corporation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Convective instabilities in a rectangular, unity-aspect-ratio Rayleigh-Bénard cell with a solution of 1.46%3He in superfluid4He have been studied in the temperature range 0.70-1.05 K, with a corresponding Prandtl number range of 0.045<σ<0.15. The onset of stationary convection is much like that in a classical, one-component fluid. The oscillatory instability is studied by using an extremely sensitive local temperature probe. It is found that the total heat transport efficiency is suppressed by the oscillations in the entire range of Prandtl number we have studied. The local temperature probe indicates a striking difference in the oscillatory amplitude when the sense of rotation of the convective rolls is reversed. The magnitude of the convective velocity is deduced from both the initial slope of the Nusselt number near the onset of the stationary convection and the frequency of the oscillations. Determinations of the temperature dependence of the convective velocity using these two methods agree very well. The observed behavior of the oscillatory frequency and onset condition supports the theory of oscillatory convection for a classical, low-Prandtl-number, one-component fluid. © 1985 Plenum Publishing Corporation.
13.
Y Maeno, H Haucke, J C Wheatley
Transition to oscillatory convection in a He3 superfluid-He4 mixture Journal Article
In: Physical Review Letters, vol. 54, no. 4, pp. 340-342, 1985.
@article{Maeno1985340,
title = {Transition to oscillatory convection in a He3 superfluid-He4 mixture},
author = {Y Maeno and H Haucke and J C Wheatley},
doi = {10.1103/PhysRevLett.54.340},
year = {1985},
date = {1985-01-01},
journal = {Physical Review Letters},
volume = {54},
number = {4},
pages = {340-342},
abstract = {The oscillatory instability of Rayleigh-Bénard convection is studied in a solution of 1.46% He3 in superfluid He4 for the Prandtl-number range 0.045<<~0.15. The observed behaviors of the oscillatory frequency and the onset condition support the theory of oscillatory convection for a classical, low-Prandtl-number, one-component fluid. © 1985 The American Physical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The oscillatory instability of Rayleigh-Bénard convection is studied in a solution of 1.46% He3 in superfluid He4 for the Prandtl-number range 0.045<<~0.15. The observed behaviors of the oscillatory frequency and the onset condition support the theory of oscillatory convection for a classical, low-Prandtl-number, one-component fluid. © 1985 The American Physical Society.
12.
K Satoh, T Fujita, Y Maeno, Y Onuki, T Komatsubara, T Ohtsuka
Anisotropic specific heat of CeCu6 in magnetic fields Journal Article
In: Solid State Communications, vol. 56, no. 4, pp. 327-331, 1985.
@article{Satoh1985327,
title = {Anisotropic specific heat of CeCu6 in magnetic fields},
author = {K Satoh and T Fujita and Y Maeno and Y Onuki and T Komatsubara and T Ohtsuka},
doi = {10.1016/0038-1098(85)90395-3},
year = {1985},
date = {1985-01-01},
journal = {Solid State Communications},
volume = {56},
number = {4},
pages = {327-331},
abstract = {The specific heat of a single crystalline CeCu6 was measured at low temperatures down to 0.15 K in magnetic fields up to 6 T. The ratio of the specific heat to temperature, C/T, showed anomalously large values at low temperatures, indicating the heavy Fermi-liquid nature of a Kondo-lattice ground state. The magnetic fields suppressed C/T at low temperatures. Varying the field directions with respect to the crystallographic axes, an anisotropy in C/T was found for the first time, which is consistent with the results of the magnetic susceptibility and the magnetoresistance at low temperatures. The observed behavior of C/T is interpreted by a simple model with Lorentzian density of states at the Fermi level. © 1985.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The specific heat of a single crystalline CeCu6 was measured at low temperatures down to 0.15 K in magnetic fields up to 6 T. The ratio of the specific heat to temperature, C/T, showed anomalously large values at low temperatures, indicating the heavy Fermi-liquid nature of a Kondo-lattice ground state. The magnetic fields suppressed C/T at low temperatures. Varying the field directions with respect to the crystallographic axes, an anisotropy in C/T was found for the first time, which is consistent with the results of the magnetic susceptibility and the magnetoresistance at low temperatures. The observed behavior of C/T is interpreted by a simple model with Lorentzian density of states at the Fermi level. © 1985.
11.
Y Onuki, Y Shimizu, T Komatsubara, A Sumiyama, Y Oda, H Nagano, T Fujita, Y Maeno, K Satoh, T Ohtsuka
Characteristics of a new Kondo lattice substance: CeCu6 Journal Article
In: Journal of Magnetism and Magnetic Materials, vol. 52, no. 1-4, pp. 344-346, 1985.
@article{Onuki1985344,
title = {Characteristics of a new Kondo lattice substance: CeCu6},
author = {Y Onuki and Y Shimizu and T Komatsubara and A Sumiyama and Y Oda and H Nagano and T Fujita and Y Maeno and K Satoh and T Ohtsuka},
doi = {10.1016/0304-8853(85)90298-7},
year = {1985},
date = {1985-01-01},
journal = {Journal of Magnetism and Magnetic Materials},
volume = {52},
number = {1-4},
pages = {344-346},
abstract = {The anisotropic magnetic properties of CeCu6 have been experimentally obtained, and the Kondo lattice has been found to be formed above x = 0.8-0.9 in CexLa1-xCu6. © 1985.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The anisotropic magnetic properties of CeCu6 have been experimentally obtained, and the Kondo lattice has been found to be formed above x = 0.8-0.9 in CexLa1-xCu6. © 1985.
1984
10.
H Haucke, Y Maeno, J C Wheatley
PERIOD-DOUBLING TWO-TORUS STATE IN A CONVECTING **3He-SUPERFLUID **4He SOLUTION. Conference
no. pt 2, 1984.
@conference{Haucke19841123,
title = {PERIOD-DOUBLING TWO-TORUS STATE IN A CONVECTING **3He-SUPERFLUID **4He SOLUTION.},
author = {H Haucke and Y Maeno and J C Wheatley},
year = {1984},
date = {1984-01-01},
number = {pt 2},
pages = {1123-1124},
abstract = {We present observations of the nonlinear dynamical behavior of a convecting dilute solution of **3He in superfluid **4He which approaches a chaotic state via a period-doubling sequence of one of two incommensurate frequencies.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
We present observations of the nonlinear dynamical behavior of a convecting dilute solution of **3He in superfluid **4He which approaches a chaotic state via a period-doubling sequence of one of two incommensurate frequencies.
9.
Y Maeno, H Haucke, R Ecke, J C Wheatley
ONSET OF OSCILLATIONS IN SYMMETRIC CONVECTIVE STATES IN A SUPERFLUID **3He-**4He MIXTURE. Conference
no. pt 2, 1984.
@conference{Maeno19841125,
title = {ONSET OF OSCILLATIONS IN SYMMETRIC CONVECTIVE STATES IN A SUPERFLUID **3He-**4He MIXTURE.},
author = {Y Maeno and H Haucke and R Ecke and J C Wheatley},
year = {1984},
date = {1984-01-01},
number = {pt 2},
pages = {1125-1126},
abstract = {The oscillatory convective instability in a solution of 1. 46% **3He in superfluid **4He is studied in the Prandtl number range of 0. 04 APP 1STH sigma APP 1STH 0. 15. The observed behavior supports the theory of oscillatory convection for a classical, low-Prandtl-number, one-component fluid. A local temperature probe indicates a striking difference in the oscillatory amplitude when the sense of rotation of the convective rolls is reversed.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
The oscillatory convective instability in a solution of 1. 46% **3He in superfluid **4He is studied in the Prandtl number range of 0. 04 APP 1STH sigma APP 1STH 0. 15. The observed behavior supports the theory of oscillatory convection for a classical, low-Prandtl-number, one-component fluid. A local temperature probe indicates a striking difference in the oscillatory amplitude when the sense of rotation of the convective rolls is reversed.
8.
H Haucke, R E Ecke, Y Maeno, J C Wheatley
Noise-induced intermittency in a convecting dilute solution of He3 in superfluid He4 Journal Article
In: Physical Review Letters, vol. 53, no. 22, pp. 2090-2093, 1984.
@article{Haucke19842090,
title = {Noise-induced intermittency in a convecting dilute solution of He3 in superfluid He4},
author = {H Haucke and R E Ecke and Y Maeno and J C Wheatley},
doi = {10.1103/PhysRevLett.53.2090},
year = {1984},
date = {1984-01-01},
journal = {Physical Review Letters},
volume = {53},
number = {22},
pages = {2090-2093},
abstract = {Measurements on a convecting dilute He3-superfluid-He4 solution show a transition from periodic to chaotic behavior via intermittency. In a region near but below the onset of intermittency, injection of external noise greater than some threshold value induces chaos. © 1984 The American Physical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Measurements on a convecting dilute He3-superfluid-He4 solution show a transition from periodic to chaotic behavior via intermittency. In a region near but below the onset of intermittency, injection of external noise greater than some threshold value induces chaos. © 1984 The American Physical Society.
7.
R E Ecke, Y Maeno, H Haucke, J C Wheatley
Critical dynamics near the oscillatory instability in Rayleigh- Bénard convection Journal Article
In: Physical Review Letters, vol. 53, no. 16, pp. 1567-1570, 1984.
@article{Ecke19841567,
title = {Critical dynamics near the oscillatory instability in Rayleigh- Bénard convection},
author = {R E Ecke and Y Maeno and H Haucke and J C Wheatley},
doi = {10.1103/PhysRevLett.53.1567},
year = {1984},
date = {1984-01-01},
journal = {Physical Review Letters},
volume = {53},
number = {16},
pages = {1567-1570},
abstract = {The oscillatory temperature amplitude of a low-Prandtl-number fluid in Rayleigh-Bénard convection is shown to exhibit critical slowing down near the onset of oscillatory convection. The data are analyzed in the context of a mean-field Landau-Hopf equation. We find the magnitude of the power-law exponent for the dynamic relaxation to be 1.01±0.02 and 1.00±0.02 above and below onset, respectively, in agreement with the theoretical predictions. © 1984 The American Physical Society.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The oscillatory temperature amplitude of a low-Prandtl-number fluid in Rayleigh-Bénard convection is shown to exhibit critical slowing down near the onset of oscillatory convection. The data are analyzed in the context of a mean-field Landau-Hopf equation. We find the magnitude of the power-law exponent for the dynamic relaxation to be 1.01±0.02 and 1.00±0.02 above and below onset, respectively, in agreement with the theoretical predictions. © 1984 The American Physical Society.
1983
6.
Yoshiteru Maeno, Hans Haucke, John Wheatley
UNDERSTANDING EXPERIMENTALLY THE TRANSITION TO CHAOS IN A CONVECTING DILUTE SOLUTION OF **3He IN SUPERFLUID **4He. Conference
no. 103, 1983.
@conference{Maeno1983412,
title = {UNDERSTANDING EXPERIMENTALLY THE TRANSITION TO CHAOS IN A CONVECTING DILUTE SOLUTION OF **3He IN SUPERFLUID **4He.},
author = {Yoshiteru Maeno and Hans Haucke and John Wheatley},
year = {1983},
date = {1983-01-01},
journal = {AIP Conference Proceedings},
number = {103},
pages = {412-427},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
5.
Yoshiteru Maeno, H Haucke, John Wheatley
SIMPLE DIFFERENTIAL THERMOMETER USING A THERMOCOUPLE WITH A SQUID DETECTOR. Conference
no. 103, 1983.
@conference{Maeno1983467,
title = {SIMPLE DIFFERENTIAL THERMOMETER USING A THERMOCOUPLE WITH A SQUID DETECTOR.},
author = {Yoshiteru Maeno and H Haucke and John Wheatley},
year = {1983},
date = {1983-01-01},
journal = {AIP Conference Proceedings},
number = {103},
pages = {467},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
4.
Y Maeno, H Haucke, J Wheatley
Simple differential thermometer for low temperatures using a thermocouple with a SQUID detector Journal Article
In: Review of Scientific Instruments, vol. 54, no. 8, pp. 946-948, 1983.
@article{Maeno1983946,
title = {Simple differential thermometer for low temperatures using a thermocouple with a SQUID detector},
author = {Y Maeno and H Haucke and J Wheatley},
doi = {10.1063/1.1137507},
year = {1983},
date = {1983-01-01},
journal = {Review of Scientific Instruments},
volume = {54},
number = {8},
pages = {946-948},
abstract = {Details of design and construction of a simple and rugged thermocouple differential thermometer are presented. Gold + 0.03 at % iron wire is used, with niobium leads connected to a SQUID. It is demonstrated that at 1 K the response time is about 15 ms and that the temperature sensitivity of 10- 7 K with a 10-Hz filter is Johnson-noise limited. Additional qualities such as small size, little self-heating, and high reproducibility make this device ideal for differential thermometry at low temperatures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Details of design and construction of a simple and rugged thermocouple differential thermometer are presented. Gold + 0.03 at % iron wire is used, with niobium leads connected to a SQUID. It is demonstrated that at 1 K the response time is about 15 ms and that the temperature sensitivity of 10- 7 K with a 10-Hz filter is Johnson-noise limited. Additional qualities such as small size, little self-heating, and high reproducibility make this device ideal for differential thermometry at low temperatures.
3.
H Haucke, Y Maeno
Phase space analysis of convection in a 3He-superfluid 4He solution Journal Article
In: Physica D: Nonlinear Phenomena, vol. 7, no. 1-3, pp. 69-72, 1983.
@article{Haucke198369,
title = {Phase space analysis of convection in a 3He-superfluid 4He solution},
author = {H Haucke and Y Maeno},
doi = {10.1016/0167-2789(83)90116-1},
year = {1983},
date = {1983-01-01},
journal = {Physica D: Nonlinear Phenomena},
volume = {7},
number = {1-3},
pages = {69-72},
abstract = {Observations have been made on thermal convection below 1 K in a dilute solution of 3He in superfluid 4He contained in a cylindrical cell of aspect ratio Γ=1.20. Complicated oscillatory phenomena were observed with a high degree of reproducibility using two temperature sensors. Phase space analysis suggests a description in terms of strange attractor dynamics. © 1983.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Observations have been made on thermal convection below 1 K in a dilute solution of 3He in superfluid 4He contained in a cylindrical cell of aspect ratio Γ=1.20. Complicated oscillatory phenomena were observed with a high degree of reproducibility using two temperature sensors. Phase space analysis suggests a description in terms of strange attractor dynamics. © 1983.
1981
2.
H Haucke, Y Maeno, P Warkentin, J Wheatley
Time-dependent thermal convection in dilute solutions of 3He in superfluid 4He Journal Article
In: Journal of Low Temperature Physics, vol. 44, no. 5-6, pp. 505-533, 1981.
@article{Haucke1981505,
title = {Time-dependent thermal convection in dilute solutions of 3He in superfluid 4He},
author = {H Haucke and Y Maeno and P Warkentin and J Wheatley},
doi = {10.1007/BF00117841},
year = {1981},
date = {1981-01-01},
journal = {Journal of Low Temperature Physics},
volume = {44},
number = {5-6},
pages = {505-533},
abstract = {Time-dependent thermal convection can occur in a unity-aspect-ratio Rayleigh-Beńard convection cell containing a dilute solution of 3He in superfluid 4He when the fluid is heated from above. Results are presented primarily for a 0.24 mole % He solution at 0.925 K. Means is provided for introducing heat at the top and separately for a central plug and an outer ring such that both are at a constant temperature gD T above the bottom. A critical temperature difference δTcfor convection can be defined above which both steady and time-dependent convection occur. The time-dependent effects include a region of δT. near δTcand characterized only by excessive noise, a region of somewhat higher δT where there are intermittent major changes in the plug heating rate with a time distribution like that for random events, and a region at still higher δT where periodic but nonsinusoidal variation of the heat flow is observed. When a long enough time, several months, has elapsed after cooling down the apparatus, time-dependent states no longer occur, and the heat flow above δTcis limited to steady convection. Briefly raising the temperature of the apparatus to 77 K is sufficient to restore the possibility of time-dependent states. © 1981 Plenum Publishing Corporation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Time-dependent thermal convection can occur in a unity-aspect-ratio Rayleigh-Beńard convection cell containing a dilute solution of 3He in superfluid 4He when the fluid is heated from above. Results are presented primarily for a 0.24 mole % He solution at 0.925 K. Means is provided for introducing heat at the top and separately for a central plug and an outer ring such that both are at a constant temperature gD T above the bottom. A critical temperature difference δTcfor convection can be defined above which both steady and time-dependent convection occur. The time-dependent effects include a region of δT. near δTcand characterized only by excessive noise, a region of somewhat higher δT where there are intermittent major changes in the plug heating rate with a time distribution like that for random events, and a region at still higher δT where periodic but nonsinusoidal variation of the heat flow is observed. When a long enough time, several months, has elapsed after cooling down the apparatus, time-dependent states no longer occur, and the heat flow above δTcis limited to steady convection. Briefly raising the temperature of the apparatus to 77 K is sufficient to restore the possibility of time-dependent states. © 1981 Plenum Publishing Corporation.
0000
1.
K Kumagai, M Abe, S Tanaka, Y Maeno, T Fujita
Cu-NMR study of antiferromagnetic order and superconductivity of Ln2−xCexCuO4−δ (Ln = Nd, Sm and Pr) Journal Article
In: 0000.
@article{Kumagai1990675,
title = {Cu-NMR study of antiferromagnetic order and superconductivity of Ln2−xCexCuO4−δ (Ln = Nd, Sm and Pr)},
author = {K Kumagai and M Abe and S Tanaka and Y Maeno and T Fujita},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
