低温超高圧下の精密計測技術開発による物性基礎研究
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概要
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Due to the lack of appropriate instrumentation, the amount of accurate and precision data is limited on basic physical properties connected with quantum effects and low-energy excitations in the fields of combined high pressure and low temperature. A technical breakthrough has been achieved with a set-up at ISSP, University of Tokyo, equipped with a cubic-anvil device and a top-loading cryostat. Many interesting phenomena originated from electron-electron correlation effects, such as high-Tc superconductivities, spin fluctuations, charge and valence fluctuations, and others near a quantum critical point, have been revealed at pressures extended far beyond 10 GPa and at temperatures down to ca. 2 K, some topics of which are reviewed.