UNIAXIAL PRESSURE-DEPENDENCE OF TC OF UNTWINNED YBA2CU3OX SINGLE-CRYSTALS FOR X=6.5-7

被引：65

作者：

KRAUT, O

MEINGAST, C

BRAUCHLE, G

CLAUS, H

ERB, A

MULLERVOGT, G

WUHL, H

机构：

[1] KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INFP,W-7500 KARLSRUHE 1,GERMANY

[2] UNIV KARLSRUHE,FAK PHYS,W-7500 KARLSRUHE,GERMANY

[3] UNIV ILLINOIS,CHICAGO,IL 60680

来源：

PHYSICA C | 1993年 / 205卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(93)90180-X

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The dependence of T(c) on uniaxial pressure dT(c)/dp(i) (i = a, b, c) is determined for untwinned YBa2Cu3Ox single crystals as a function of O-content using ultrahigh-resolution thermal-expansion data and the Ehrenfest relationship. The dT(c)/dp(i) values are found to be highly anisotropic and are likely due to several different effects. For uniaxial-pressure applied parallel to the c-axis, we find a strong O-content (or carrier density) dependence of the dT(c)/dp(c) values, consistent with a simple pressure induced charge transfer model. This model does not, however, explain the large dT(c)/dp(a) and dT(c)/dp(b) values, which have opposite signs and do not show a strong O-content dependence except at x = 6.7, where both dT(c)/dp(a) and dT(c)/dp(b) values increase sharply. The a, b effects are discussed in terms of the orthorhombic distortion.

引用

页码：139 / 146

页数：8

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