(P, T) Phase Diagram of Clathrate Superconductor Ba24Ge100

被引：0

作者：

Miyake, Atsushi ^{[1
]}

Kagayama, Tomoko ^{[1
]}

Shimizu, Katsuya ^{[1
]}

Tang, Jun ^{[2
]}

Tanigaki, Katsumi ^{[2
]}

机构：

[1] Osaka Univ, KYOKUGEN, Toyonaka, Osaka 560, Japan

[2] Tohoku Univ, WPI Grad Sch Sci, Sendai, Miyagi, Japan

来源：

INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010) | 2011年 / 273卷

关键词：

BA6GE25;

D O I：

10.1088/1742-6596/273/1/012079

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Precise electrical resistivity and ac calorimetry measurements under pressure shave revealed (P, T) phase diagram of superconducting clathrate Ba24Ge100. Following conventional superconducting theory, the pressure dependence of the density of state at Fermi energy, N(E-F), estimated by the electronic specific heat C/T has been discussed with the T-c(P). Up to P=2.1 GPa, where T-c (P) starts to saturate, C/T increases with T-c in agreement with the theory. On further compression, C/T is strongly suppressed while T-c slightly decreases. Across P-c similar to 2.9 GPa, where structural deforming transitions at T-s1(s2) are suppressed, pressure variation of C/T becomes smaller. In addition to the enhancement of the N(E-F), other changes in crystal and/or electrical structure may play important roles to pressure dependence of T-c in Ba24Ge100.

引用

页数：4

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