Development of Accurate and Precision Measurement Techniques for Research in Basic Solid State Physics under High Pressure at Low Temperatures

Abstract

  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-T_c 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.