PRESSURE EFFECT ON TC AND RESISTIVITY - LOCALIZATION IN YBA2CU3OX OXIDES

被引：38

作者：

MEDVEDEVA, IV ^{[1
]}

BERSENEV, YS ^{[1
]}

GIZHEVSKY, BA ^{[1
]}

CHEBOTAEV, NM ^{[1
]}

NAUMOV, SV ^{[1
]}

DEMISHEV, GB ^{[1
]}

机构：

[1] ACAD SCI USSR, INST HIGH PRESSURE PHYS, TROITSK 142092, USSR

来源：

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1990年 / 81卷 / 03期

关键词：

D O I：

10.1007/BF01390810

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have studied the effect of hydrostatic pressures up to 20 Kbar on the temperature dependence of the resistivity σ(T) and the effect of quasihydrostatic pressure up to 200 Kbar on the lattice parameters of YBa2Cu3Ox for different oxygen concentrations (x=6.95-6.2). Pressure produces a decrease of resistivity in normal state, an increase of Tc, and a suppression of semiconducting-like resistivity σ(T) at low x. The dependence of d Tc(x)/d P on x is nonmonotonic; the record values of d Tc/d P=(1.0±0.1) K/Kbar are observed for x=6.7 and 6.8. The derivative dlnσ/d P at T=293 K differs by the factor 1.8 between superconducting and nonsuperconducting compounds. The compressibility and its pressure derivative along a, b and c-directions in YBa2Cu3Ox have been determined. The most remarkable variation is along c-direction. A nonmonotonic dependence of d kc(x)/d P on x has been observed. The results are discussed in the context of localized effects in disordered oxygen-deficient YBa2Cu3Ox. © 1990 Springer-Verlag.

引用

页码：311 / 317

页数：7

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