Koichi MATSUMOTO

Professor,School of Mathematics and Physics, Kanazawa University

Topics of Research：

(B01) Novel Edge Phenomena in Spin-Triplet Superfluids

■ Description of Research [191KB]

RESEARCH

I have studied on quantum fluid and solid in both ³He and ⁴He. I have been studying ³He superfluidity in 97% open aerogel by means of ultrasound. It is found that the critical pressure increases for 97% open aerogel and much stronger impurity effect than 98% open gel. The co-existing state of these phases is robust in our gel.

In this project, I will investigate physics of proximity-induced odd-frequency Cooper pairs in superfluid ³He/aerogel composite system experimentally.

EDUCATION

1983

Bachelor of Science, Tokyo Institute of Technology.

1988

Doctor of Engineering, Tokyo Institute of Technology.

PROFESSIONAL EXPERIENCE

1989

Research associate, Tokyo Institute of Technology

1999

Associate professor, Kanazawa University

2010-Present

Professor, Kanazawa University

SELECTION OF PUBLICATIONS

"Ultrasound study of the solid-liquid transition and solid-liquid interface of ⁴He in aerogels",
Koichi Matsumoto, Hiroyuki Tsuboya, Keiichi Yoshino, Satoshi Abe, Hiroyuki Tsujii, and Haruhiko Suzuki
J. Phys. Soc. Jpn., 78, 034601 (2009).

"Novel Quantum Criticality in CeRu₂Si₂ near Absolute Zero Observed by Thermal Expansion and Magnetostriction",
J. Yoshida, S. Abe, D. Takahashi, Y. Segawa, Y. Komai, H. Tsujii, K. Matsumoto, H. Suzuki, and Y. Onuki,
Phys. Rev. Lett., 101 256402 (2008).

"Possible Sound Mode Conversion in "Superfluid ⁴He-97% Open Aerogel" System",
Koichi Matsumoto, Hiroyuki Tsuboya, Keiichi Yoshino, Satoshi Abe, Haruhiko Suzuki, and Dmitrii Tayurskii
J. Low Temp. Phys., 148 615-620 (2007).

"Dissipation Mechanisms near the Superfluid ³He Transition in Aerogel",
A. Golov, D. Einzel, G. Lawes, K. Matsumoto, and J. M. Parpia,
Phys. Rev. Lett., 92 195301 (2004).

"Quantum Phase Transition of ³He in Aerogel at a Nonzero Pressure",
K. Matsumoto, J.V. Porto, L. Pollack, E.N. Smith, T.L. Ho, and J. Parpia,
Phys. Rev. Lett., 79 253-256 (1997).