Critical exponents of the superconducting transition in granular YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}
- Laboratory for Low Temperature Physics, Department of Physics and Astronomy, University of Massachusetts, Amherst, Massachusetts 01003 (United States)
- New York State College of Ceramics, Alfred University, 2 Pine Street, Alfred, New York 14802 (United States)
We present the results of measurements designed to study superconducting I-V scaling in samples of polycrystalline YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} with varying mean grain sizes, 1 {mu}m{le}{l_angle}d{sub g}{r_angle}{le}20 {mu}m at selected magnetic fields, 0.5 G{le}H{le}10 T. I-V isotherm measurements performed near the superconducting transition on the samples are consistent with recent predictions of I-V scaling, with critical exponents {nu}{approximately}1.1{endash}1.75 and z{approximately}2.3{endash}4.3. The values for {nu} are comparable to those previously reported. The values for z are somewhat lower than what is predicted by the glassy models. The static exponent {nu} does not display any grain-size or magnetic-field dependence. The dynamic exponent, however, does display some morphology dependence with z higher for the small grain-size samples. The data shows some evidence for a crossover between low and high z values in increasing magnetic fields. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 541952
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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