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

P. L. Gammel, Lynn Schneemeyer, D. J. Bishop

Research output: Contribution to journalArticle

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Abstract

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 105 vortices near the transition, combined with the qualitative failure of thermal-activation models to fit our data, support the existence of a phase transition.

Original languageEnglish
Pages (from-to)953-956
Number of pages4
JournalPhysical Review Letters
Volume66
Issue number7
DOIs
StatePublished - 1 Jan 1991

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vortices
single crystals
temperature
exponents
activation
glass
electric potential
curves
thin films
crystals

Cite this

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abstract = "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 105 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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SQUID picovoltometry of YBa2Cu3O7 single crystals : Evidence for a finite-temperature phase transition in the high-field vortex state. / Gammel, P. L.; Schneemeyer, Lynn; Bishop, D. J.

In: Physical Review Letters, Vol. 66, No. 7, 01.01.1991, p. 953-956.

Research output: Contribution to journalArticle

TY - JOUR

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AB - 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 105 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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