UNIAXIAL PRESSURE-DEPENDENCE OF T(C) OF SINGLE-CRYSTALLINE YBA2CU4O8 VIA THERMAL-EXPANSION

被引：35

作者：

MEINGAST, C ^{[1
]}

KARPINSKI, J ^{[1
]}

JILEK, E ^{[1
]}

KALDIS, E ^{[1
]}

机构：

[1] SWISS FED INST TECHNOL,FESTKORPERPHYS LAB,CH-8093 ZURICH,SWITZERLAND

来源：

PHYSICA C | 1993年 / 209卷 / 04期

关键词：

D O I：

10.1016/0921-4534(93)90580-J

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The anisotropic response of an YBa2Cu4O8 single crystal to superconducting order is studied using an ultrahigh resolution capacitance dilatometer. A shortening of the crystal below T(c) is observed along the a-axis, whereas little or no response is seen along the b- and c-axis lattice directions. The dependence of T(c) on uniaxial pressure, dT(c)/dp(i) (i=a,b,c), is determined using the thermal expansion data and one of the Ehrenfest relationships. We find that dT(c)/dp(a)=+(3.7-5.0) K/GPa, dT(c)/dp(b)=+(0.3-0.4) K/GPa, and dT(c)/dp(c)=(0+/-0.7) K/GPa, which shows that the large hydrostatic pressure dependence of T(c) results mainly from the uniaxial effect along the a-axis.

引用

页码：591 / 596

页数：6

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