Enhancement of Superconducting Transition Temperature in CeCu2Ge2 under High Pressures.

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  • Kobayashi Tatsuo C.
    Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560 CREST, Japan Science and Technology Corporation (JST)
  • Miyazu Tadashi
    Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560
  • Takeshita Nao
    Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560
  • Shimizu Katsuya
    Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560 CREST, Japan Science and Technology Corporation (JST)
  • Amaya Kiichi
    Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560 CREST, Japan Science and Technology Corporation (JST)
  • Kitaoka Yoshio
    Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560 CREST, Japan Science and Technology Corporation (JST)
  • Onuki Yoshichika
    Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560

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  • Enhancement of Superconducting Transiti
  • Enhancement of Superconducting Transition Temperature in CeCu<sub><b>2</b></sub>Ge<sub><b>2</b></sub>under High Pressures

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Abstract

Enhancement of superconducting transition temperature Tc is confirmed at around 16 GPa in the pressure-induced superconductor CeCu_2Ge_2.The superconducting Hc-Tc phase diagrams at the low-Tc and high-Tc pressure regions indicates that the heavy quasi particles form the singlet Cooper pairs.At both low-Tc and high-Tc pressure regions, Fermi liquid behavior of ρ-- AT^2 is observed only at low temperatures below 1 K in the normal state induced by the external field above Hc2.At 21 GPa where the superconductivity disappears down to 50 mK, the temperature region following ρ-- AT^2 increases drastically up to 40 K and the coefficient A decreases rapidly.These results indicate that the strongly correlated electrons are responsible essentially for the appearance of superconductivity in this system.

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