ANISOTROPIC UNIAXIAL PRESSURE EFFECTS IN YBA2CU3O7-DELTA

被引：33

作者：

WELP, U ^{[1
]}

GRIMSDITCH, M ^{[1
]}

FLESHLER, S ^{[1
]}

NESSLER, W ^{[1
]}

VEAL, B ^{[1
]}

CRABTREE, GW ^{[1
]}

机构：

[1] ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCTIV,ARGONNE,IL 60439

来源：

JOURNAL OF SUPERCONDUCTIVITY | 1994年 / 7卷 / 01期

关键词：

UNIAXIAL PRESSURE DEPENDENCE; YBA2CU3O7-DELTA; RESISTIVITY;

D O I：

10.1007/BF00730387

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present measurements of the uniaxial pressure dependence of T(c) of untwinned YBa2Cu3O7-delta crystals with various oxygen stoichiometries. For all samples investigated, T(c) decreases for pressure along a, increases for pressure along b, and, in oxygen deficient samples, increases strongly for pressure along c. These results are compared to the behavior found in the La2-xSrCuO4 and YBa2Cu4O8 systems. Neither the model of pressure-induced charge transfer nor coupling to orthorhombic distortions can explain all the data. However, the presence of singularities in the electronic density of states close to the Fermi energy is a possible origin of the observed behavior. Our preliminary data on the pressure dependence of the c-axis and in-plane resistivities in twinned crystals are consistent with this view.

引用

页码：159 / 164

页数：6

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