Masuda, Takatsugu
Associate Professor
Neutron Science Laboratory
University of Tokyo
Japan
Biography
One of the research goals in our group is to find a novel quantum phenomenon and to reveal its mechanism in low-dimensional spin magnets and frustrated magnets. Strong quantum fluctuation or geometrical frustration disturbs the development of trivial magnetic states and induces a non-trivial quantum state. Furthermore such a state is sensitive to a small perturbation and, thus, the area is frontier of quantum phenomena. Our research topic includes spin liquid, RVB, Cuboc structure, etc. Another goal is to observe a new magnetoelectric effect in multiferroic compounds and/or relaxor magnets. Figures (a) and (b) show neutron spectra of breathing pyrochlore antiferromagnet Ba3Yb2Zn5O11 and the analyses reveal that the ground state is quasi-doublet. In the measured entropy in Fig. (c) we observe that unique ground state is selected and a novel spin liquid is realized at very low temperature.
Research Interest
Magnetic structure and excitations in frustrated magnets and quantum magnets Multiferroics Magnetic excitation in supercrystal of oxygen molecule in nanoporous metal complex
Publications
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A layered wide-gap oxyhalide semiconductor with an infinite ZnO 2 square planar sheet: Sr 2 ZnO 2 Cl 2: Y. Su, Y. Tsujimoto, A. Miura, S. Asai, M. Avdeev, H. Ogino, M. Ako, A. A. Belik, T. Masuda, T. Uchikoshi and K. Yamaura, Chem. Commun. 53 (2017) 3826-3829.
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Spin pseudogap in the S=1/2 chain material Sr2CuO3 with impurities: G. Simutis, S. Gvasaliya, N. S. Beesetty, T. Yoshida, J. Robert, S. Petit, A. I. Kolesnikov, M. B. Stone, F. Bourdarot, H. C. Walker, D. T. Adroja, O. Sobolev, C. Hess, T. Masuda, A. Revcolevschi, B. Büchner and A. Zheludev, Phys. Rev. B 95 (2017) 054409.
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Magnetic Structure and Dielectric State in the Multiferroic Ca 2 CoSi 2 O 7: M. Soda, S. Hayashida, T. Yoshida, M. Akaki, M. Hagiwara, M. Avdeev, O. Zaharko and T. Masuda, J. Phys. Soc. Jpn. 86 (2017) 064703(1-5).
