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.
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页码：591 / 596
页数：6
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