Large Anisotropic Uniaxial Pressure Dependencies of Tc in Single Crystalline Ba(Fe0.92Co0.08)2As2

被引：64

作者：

Hardy, Frederic ^{[1
]}

Adelmann, Peter ^{[1
]}

Wolf, Thomas ^{[1
]}

v. Loehneysen, Hilbert ^{[1
,2
]}

Meingast, Christoph ^{[1
]}

机构：

[1] Forschungszentrum Karlsruhe, Inst Festkorperphys, D-76021 Karlsruhe, Germany

[2] Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 18期

关键词：

RESOLUTION THERMAL-EXPANSION; SUPERCONDUCTIVITY;

D O I：

10.1103/PhysRevLett.102.187004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using high-resolution dilatometry, we study the thermodynamic response of the lattice parameters to superconducting order in a self-flux grown Ba(Fe0.92Co0.08)(2)As-2 single crystal. The uniaxial-pressure dependencies of the critical temperature T-c calculated using our thermal-expansion and specific-heat data via the Ehrenfest relation, are found to be quite large and very anisotropic (dT(c)/dp(a)=3.1(1) K/GPa and dT(c)/dp(c)=-7.0(2) K/GPa). Our results show that there is a strong coupling of the c/a ratio to superconducting order, which demonstrates that T-c is far from the optimal value.

引用

页数：4

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