Faculty of Science and Technology, Department of Engineering and Applied Sciences
Job title
Professor
Degree
理学博士(東京大学)
Research funding number
90215492
J-Global ID
200901036665053574
Profile
In the graduate days, worked on the quantum size effect in small metal particles of nano-size, for which the discreteness in the energy levels of conduction electrons was successfully observed in the dilution temperature region below few tens milli-Kelvin. Since 1989, started working in the laboratory of low temperature physics in Institute for Materials Research at Tohoku University, as a research staff, where I had built three sets of NMR spectrometers, by which high-TC cuprates and organic conductors were studied. I had revealed that the universal electronic phase diagram for high-TC cuprates holds for Tl-based cuprate. I found the first evidence that the non-doped Tl-based cuprate is antiferromagnetism, and that the characteristic energy of spin fluctuation in the antiferromagnetic region possibly determines TC. In 1998, moved on to Sophia Univ. as an associate professor, where I started up the laboratory for low-temperature physics. The research area was expanded to other exotic matters such as low dimensional quantum spin magnets, and organic metals. From 2004, a new technique of muSR in collaboration with RIKEN-RAL and PSI was adopted and applied to quantum spin systems.Lectures and experiments: Statistical Physics II, Analytical Mechanics, Experimental Physics ("magnetic resonance"), Exercise for Quantum Mechanics, Physics Experiments I, Physics Experiments III, Condensed matter physics. Current research themes are NMR study on quantum spin magnet, high-Tc cuprates and orgamic metals in low temperatures and high magnetic field.(Subject of research) NMR and muSR study on high-Tc cuprates and low dimensional quantum spin systems.
Research Interests
NMR
,Superconductivity
,magnetism
Research Areas
Natural sciences / Magnetism, superconductivity, and strongly correlated systems /
We report the magnetic properties of the double perovskites SrLaCuSbO6 (SLCSO) and SrLaCuNbO6 (SLCNO). The temperature dependence of the magnetic susceptibilities of both compounds shows a broad maximum characteristic of an S=1/2 square lattice He...
Key Engineering Materials 860 142-147 Aug 2020 [Refereed]
We report the results of the resistivity measurement on La2-xSrxCuO4 nanoparticles with x = 0, 0.05, and 0.20 evaluated by the four-point probe method. The high resistivity value shows the predominance of the inter-grain part. The temperature depe...
Takumi Kusakawa   Takayuki Goto   Akiko Hori   
CrystEngComm 22(18) 3090-3094 Apr 2020 [Refereed]
Expanded p-conjugated coordination complexes, [M(L2)2] (M = Cu2+, Pd2+, and Pt2+; L2= dinaphthoylmethanido-), were prepared and the different metal characteristics were found due to the supramolecular associations: [Cu(L2)2] shows a remarkable M2+...
Materials Science Forum 966 357-362 Aug 2019 [Refereed]
Nano-size effect on structure of crystal of free-standing La2-xSrxCuO4 (LSCO) nanoparticles was observed to reveal size effects of La-based high-Tc superconducting oxides. Lattice parameters were estimated by changing temperature and time of sinte...
IEEE TRANSACTIONS ON MAGNETICS 13(2) 4pages Dec 2018 [Refereed]
Low-Temperature magnetic properties were investigated on the gold nano particles (GNPs) with an average size of 11.5 nm, assembled with molecules of ruthenium complex (Ru0), and phenylboronic acid (B0) by the proton nuclear magnetic resonance (1H-...