Enhancement of Superconducting Transition Temperature in CeCu2Ge2 under High Pressures

Tatsuo C. Kobayashi, Tadashi Miyazu, Nao Takeshita, Katsuya Shimizu, Kiichi Amaya, Yoshio Kitaoka, Yoshichika Onuki

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Enhancement of superconducting transition temperature Tc is confirmed at around 16 GPa in the pressure-induced superconductor CeCu2Ge2. 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 p ∼ AT2 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 ∼ AT2 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.

Original languageEnglish
Pages (from-to)996-999
Number of pages4
Journaljournal of the physical society of japan
Volume67
Issue number3
DOIs
Publication statusPublished - Mar 1998
Externally publishedYes

Keywords

  • Heavy fermion
  • High pressure
  • Superconductivity
  • Transport properties

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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