理工学部 機能創造理工学科

Goto Takayuki

  (後藤 貴行)

Profile Information

Affiliation
Professor, Faculty of Science and Technology, Department of Engineering and Applied Sciences, Sophia University
Degree
理学博士(東京大学)

Contact information
gotoo-tsophia.ac.jp
Researcher number
90215492
J-GLOBAL ID
200901036665053574
researchmap Member ID
1000004658

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

 3

Research History

 5

Committee Memberships

 1

Papers

 223
  • Takayuki Goto, Takeshi Hashimoto, Kai Sato, Yukihiro Kitamoto, Takashi Hayashita, Satoshi Iguchi, Takahiko Sasaki, Dita Puspita Sari, Isao Watanabe
    Journal of the Physical Society of Japan, 92(12), Dec 15, 2023  Peer-reviewed
  • Iori Nishizawa, Nobuyuki Kurita, Hidekazu Tanaka, Takayuki Goto
    Physical Review B, 107(17), May 12, 2023  Peer-reviewed
  • Masari Watanabe, Nobuyuki Kurita, Hidekazu Tanaka, Wataru Ueno, Kazuki Matsui, Takayuki Goto, Masato Hagihala
    Physical Review B, 105(5), Feb 1, 2022  Peer-reviewed
    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 Heisenberg antiferromagnet. Magnetic ordering occurs at TN=13.6 and 15.7 K for SLCSO and SLCNO, respectively. Neutron powder diffraction measurements reveal contrasting spin structures in both compounds. The spin structures of SLCSO and SLCNO below TN are Néel antiferromagnetic and columnar antiferromagnetic, respectively. This result demonstrates that the nearest-neighbor interaction is dominant in SLCSO, whereas the next-nearest-neighbor interaction is dominant in SLCNO. The magnitude of the ordered moment was evaluated at 3.5 K to be m=0.39(3)μB for SLCSO and 0.37(1)μB for SLCNO, which are significantly smaller than those calculated using linear spin wave theory. We infer that the small ordered moment is caused by the effect of bond randomness arising from the site disorder of Sr and La ions.
  • Suci Winarsih, Faisal Budiman, Hirofumi Tanaka, Tadashi Adachi, Takayuki Goto, Bambang Soegijono, Budhy Kurniawan, Isao Watanabe
    Key Engineering Materials, 860 142-147, Aug 1, 2020  Peer-reviewed
    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 dependence of the conductivity can be analyzed by variable range hopping model showing the charge carriers are formed by thermal activation. There is no superconducting behavior that could be observed in La2-xSrxCuO4 nanoparticles with x = 0.05 and 0.20.
  • Takumi Kusakawa, Takayuki Goto, Akiko Hori
    CrystEngComm, 22(18) 3090-3094, Apr 27, 2020  Peer-reviewed
    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+?p interaction (3.249 Å) inducing the cationicity of Cu2+and the strength of the interactions clearly decreases for the Pd2+and Pt2+ions (3.785 and 4.610 Å), indicating their electron-rich and nucleophilic characteristics.

Misc.

 230

Books and Other Publications

 6

Presentations

 101

Professional Memberships

 1

Research Projects

 25

Other

 5