SQUID PICOVOLTOMETRY OF YBA2CU3O7 SINGLE-CRYSTALS - EVIDENCE FOR A FINITE-TEMPERATURE PHASE-TRANSITION IN THE HIGH-FIELD VORTEX STATE

被引：366

作者：

GAMMEL, PL

SCHNEEMEYER, LF

BISHOP, DJ

机构：

[1] ATandT Bell Laboratories, Murray Hill

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 66卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.66.953

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using a SQUID picovoltmeter, we have measured current-voltage curves of YBa2Cu3O7 microtwinned crystals as a function of temperature in fields from 1 to 6 T. The data constitute evidence for a finite-temperature phase transition in the vortex state. Exponents derived within the framework of the vortex-glass model are found to be similar to thin-film values. Strongly temperature-dependent correlations involving up to 10(5) vortices near the transition, combined with the qualitative failure of thermal-activation models to fit our data, support the existence of a phase transition.

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页码：953 / 956

页数：4

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