SQUID picovoltometry of YBa2Cu3O7 single crystals : evidence for a finite-temperature phase transition in the high-field vortex state

A SQUID picovoltmeter, is used to measure 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-g...

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Bibliographic Details
Published in:Physical review letters 1991-02, Vol.66 (7), p.953-956
Main Authors: GAMMEL, P. L, SCHNEEMEYER, L.F, BISHOP, D. J
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary:A SQUID picovoltmeter, is used to measure 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 100,000 vortices near the transition, combined with the qualitative failure of thermal-activation models to fit the data, support the existence of a phase transition. (Author)
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.66.953