ISSP - The institute for Solid State Physics

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Masuda Group
Associate Professor
MASUDA,
Takatsugu

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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.

Neutron spectrum and entropy of spin frustrated magnet Ba3Yb2Zn5O11. The energy distribution of ground and excited states can be seen in neutron spectra in the panel (a) and (b). With decrease of temperature to absolute zero entropy approaches to zero in the panel (c) and accordingly the number of states changes from two to one.

Research Subjects

  1. Magnetic structure and excitations in frustrated magnets and quantum magnets
  2. Multiferroics
  3. Magnetic excitation in supercrystal of oxygen molecule in nanoporous metal complex