Zero-magnetic-field dynamic scaling in Bi_2Sr_2CaCu_2O_8 thin films
We investigate the zero-magnetic-field dynamic scaling in Bi_2Sr_2CaCu_2O_8 thin films from nonlinear current-voltage (I-V) characteristics and by using the concavity criterion recently proposed by Strachan [Phys. Rev. Lett. 87, 067007 (2001)] . We find that fresh samples show a BKT-like transition...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2004 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/52081 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/52081 |
| Access Level: | acceso abierto |
| Palabra clave: | 538.9 537 Kosterlitz-Thouless transition Josephson-junction arrays 2-Dimensional superconductors Critical-behavior Vortex fluctuations Phase-transitions Quenched Disorder Coulomb gas Xy Models Superfluids. Electricidad Electrónica (Física) Física de materiales Física del estado sólido 2202.03 Electricidad 2211 Física del Estado Sólido |
| Sumario: | We investigate the zero-magnetic-field dynamic scaling in Bi_2Sr_2CaCu_2O_8 thin films from nonlinear current-voltage (I-V) characteristics and by using the concavity criterion recently proposed by Strachan [Phys. Rev. Lett. 87, 067007 (2001)] . We find that fresh samples show a BKT-like transition with z=0.8, smaller than expected for a conventional Berezinskii-Kosterlitz- Thouless transition. The effect of sample size and finite Josephson coupling are discussed. We examine the effect of thermally-induced disorder in the oxygen sublattice finding that the BKT-like transition is suppressed by point disorder. |
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