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Two-stage crossover from thermal to quantum flux creep of dilute vortex ensembles in various high-T-c superconducting thin films
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2001 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 64, no 9Article in journal (Refereed) Published
Abstract [en]

The thermal-to-quantum flux creep crossover at low vortex densities has been studied in YBa2Cu3O7, TlBa2CaCu2O7-delta, and HgBa2CaCu2O6+delta thin films using ac susceptibility. The crossover temperatures T-cr are 10-11, 17, and 30 K, respectively. Both thermal and quantum flux creep is suppressed as the vortex density is decreased. We observe a two-stage nature in the crossover behavior which appears to be a general property of all the three materials studied.

Place, publisher, year, edition, pages
2001. Vol. 64, no 9
Keyword [en]
high-temperature superconductors, magnetic-relaxation, single-crystal, ii superconductors, ac susceptibility, bulk superconductors, collective, creep, columnar defects, current-density, vortices
URN: urn:nbn:se:kth:diva-20915ISI: 000170726000100OAI: diva2:339612
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Rao, K. V.
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