SQUID picovoltometry of YBa2Cu3O7 single crystals: Evidence for a finite-temperature phase transition in the high-field vortex state
P. L. Gammel, L. F. Schneemeyer, D. J. Bishop
DOI 10.1103/PhysRevLett.66.953 · Physical Review Letters
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88.033 | Pressure unresolved | onset |
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