ISSP - The institute for Solid State Physics

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Kohama Group
Associate Professor
KOHAMA,Yoshimitsu
Research Associate
NOMURA,
Toshihiro

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Ultra-high magnetic field (higher than 100 T) is an extreme condition that remains unexplored until recently. Many of unprecedented phenomena are expected to appear in ultra-high magnetic field region, and our group focuses on the observation/understanding of those exotic phenomena. To achieve this goal, we employ the following experimental techniques, “1. Magnetooptical measurement technique”, “2. Ultra-fast magnetoresistance measurement with micro-fabricated devises” and “3. High-field NMR experiment with a FPGA module”. With these techniques, we currently investigate the magnetotransport in topological insulators/superconductors and the novel magnetic phases in quantum spin systems. Our final goal is the condensed matter researches at ultra-high magnetic field region up to ~1000 T, and thus our future work will be also devoted to technical developments for ultra-high magnetic field generations as well as the improvements of measurement techniques.

(a) Magnetocaloric effect (MCE) of BiCu2PO6 measured by AuGe thin film. (b) Faraday rotation angle of BiCu2PO6 measured by laser optics. The MCE data should correspond to the isentropic T(H)S curve in which the temperature change due to field-induced phase transition were observed. The Faraday rotation angle was measured up to 120 T by using a single turn coil system, where the field-induced phase transitions were detected at ~60 and ~90 T.

Research Subjects

  1. Magneto-optical measurements with laser optics and its application to ultra-high magnetic field science
  2. NMR measurement under pulsed fields and its application to frustrated magnetic materials
  3. Development of new devise with Nanofabrication process
  4. Observation of Quantum Oscillation in Ultra-high magnetic fields and fermiology of topological insulators
  5. Development of new measurement devise with Nanofabrication technology