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

doi:10.1143/jpsj.67.996

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 journal › Article › peer-review

20 Citations (Scopus)

Abstract

Enhancement of superconducting transition temperature T_c is confirmed at around 16 GPa in the pressure-induced superconductor CeCu₂Ge₂. The superconducting H_c - T_c phase diagrams at the low-T_c and high-T_c pressure regions indicates that the heavy quasi particles form the singlet Cooper pairs. At both low-T_c and high-T_c 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 H_c2. 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 language	English
Pages (from-to)	996-999
Number of pages	4
Journal	journal of the physical society of japan
Volume	67
Issue number	3
DOIs	https://doi.org/10.1143/jpsj.67.996
Publication status	Published - Mar 1998
Externally published	Yes

Keywords

Heavy fermion
High pressure
Superconductivity
Transport properties

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/jpsj.67.996

Cite this

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title = "Enhancement of Superconducting Transition Temperature in CeCu2Ge2 under High Pressures",

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.",

keywords = "Heavy fermion, High pressure, Superconductivity, Transport properties",

author = "Kobayashi, {Tatsuo C.} and Tadashi Miyazu and Nao Takeshita and Katsuya Shimizu and Kiichi Amaya and Yoshio Kitaoka and Yoshichika Onuki",

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T1 - Enhancement of Superconducting Transition Temperature in CeCu2Ge2 under High Pressures

AU - Kobayashi, Tatsuo C.

AU - Miyazu, Tadashi

AU - Takeshita, Nao

AU - Shimizu, Katsuya

AU - Amaya, Kiichi

AU - Kitaoka, Yoshio

AU - Onuki, Yoshichika

PY - 1998/3

Y1 - 1998/3

N2 - 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.

AB - 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.

KW - Heavy fermion

KW - High pressure

KW - Superconductivity

KW - Transport properties

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