This is were we announce new journal articles and conference proceedings published by members of the group.
We performed 185/187Re nuclear quadrupole resonance (NQR) measurements under pressure to investigate the superconducting properties of noncentrosymmetric superconductor Cd2Re2O7 under various crystal structures. The pressure dependence of superconducting transition temperature Tc determined through ac susceptibility measurements is consistent with the results of previous resistivity measurements [Kobayashi et al., J. Phys. Soc. Jpn. 80, 023715 (2011)]. Below 2.2 GPa, in the nuclear […]
It is theoretically predicted that the energy level of nanoparticles that have a reduced diameter down to the nanometer size will be discrete in energy level, unlike bulk materials in which energy exists continuously. This effect is called the quantum size effect or the Kubo effect after the name of Prof. Ryogo Kubo. Although it has been […]
In an antiperovskite oxide Sr3SnO, an anionic state is naively expected for tin such as (Sr2+)3Sn4-O2-. Since tin is a metallic element and tends to be cations like Sn2+ and Sn4+, the “charge-inverted” state Sn4− is unusual and very rare in oxides. However, it has not been experimentally investigated how many electrons tin actually possesses in antiperovskite oxides. We made […]
Superconductivity is known as a phenomenon where electrical resistance becomes zero when a substance is cooled to a low temperature. In superconductivity, two electrons form a paired state (superconducting pair), and in most cases the spins of the two electrons are antiparallel (called the spin singlet state). Therefore, superconductivity is destroyed under a strong magnetic field. However, the […]
UCoGe is one of the ferromagnetic superconductors that show a superconducting transition inside ferromagnetism, and it is thought that the quantum criticality of ferromagnetism is related to superconductivity. In fact, it is known that even if the ferromagnetism disappears by the application of hydrostatic pressure of about 1 GPa (10,000 atmospheric pressure), the superconducting phase still […]
From September 10th to September 13th, 2019, the Autumn Meeting of the Physical Society of Japan was held at Gifu University Yanagido Campus, and many members from our laboratory participated and gave oral and poster presentations. . Gifu University was very hot. The situation of the society is posted. Gifu University is a 30-40 minute bus ride […]
The iron-based superconductor BaFe 2 As 2 suppresses antiferromagnetism by various dopings and pressures and develops superconductivity. We applied pressure to BaFe 2 (As 1- x P x ) 2 with part of As replaced by equivalent P and searched for the essential parameters that govern the superconducting transition temperature by changing two parameters, the P substitution amount and the pressure. As shown in the figure, the superconducting transition temperature at various […]
UCoGe is a unique substance that exhibits a superconducting transition inside ferromagnetism. Based on our group’s previous studies, it is considered that large spin fluctuations in the c- axis direction (states close to the ferromagnetic transition) are essential for the development of superconductivity in this system. Since it has a close relationship with ferromagnetism, it has been expected that in […]
The ruthenium oxide superconductor Sr2RuO4 is considered to be in the spin triplet equal spin state from nuclear magnetic resonance (NMR) experiments. It is known that fluxoids are quantized in units of magnetic flux quantum Φ0 in superconductors, but in such superconducting states, wavefunctions also have spin degrees of freedom compared to orbital degrees of freedom, so flaxoids There Fai 0 will be […]