SQUID picovoltometry of single crystal Bi2Sr2CaCu2O8+δ: Observation of the crossover from high-temperature Arrhenius to low-temperature vortex-glass behavior

H. Safar; P. L. Gammel; D. J. Bishop; D. B. Mitzi; A. Kapitulnik

doi:10.1103/PhysRevLett.68.2672

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SQUID picovoltometry of single crystal Bi2Sr2CaCu2O8+δ: Observation of the crossover from high-temperature Arrhenius to low-temperature vortex-glass behavior

H. Safar, P. L. Gammel, D. J. Bishop, D. B. Mitzi, A. Kapitulnik

DOI 10.1103/PhysRevLett.68.2672 · Physical Review Letters

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Abstract

Using a SQUID voltmeter we have measured current-voltage curves in untwinned crystals of Bi2Sr2CaCu2O8+δ as a function of temperature and magnetic field. Our data show a clear crossover from high-temperature Arrhenius behavior to a critical region associated with the low-temperature three-dimensional vortex-glass phase transition. The critical exponents ν(z-1)=7±1 in this system are in accord with theoretical models and previous measurements in YBa2Cu3O7. The width of the critical region collapses below 2 T, reflecting the changing role of dimensionality with field.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure unresolved	zero_resistance
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown