Vortex liquid entanglement in irradiated YBa_(2)Cu_(3)O_(7) thin films
Epitaxial YBa_(2)Cu_(3)O_(7) thin films, grown by high-pressure dc sputtering, are irradiated with He^(+) ions at 80 keV with doses between 10^(14) and 10^(15) cm^(-2). Irradiation reduces the critical temperature but it does not modify the carrier concentration. Angle-dependent resistivity is used...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2001 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/59641 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/59641 |
| Access Level: | acceso abierto |
| Palabra clave: | 537 538.9 High-temperatures superconductors High-tc superconductors Lattice-melting transition Flux-line-lattice II superconductors Quenched disorder Phase-transitions Glass-transition Single-crystals Elastic theory. Electricidad Electrónica (Física) Física de materiales Física del estado sólido 2202.03 Electricidad 2211 Física del Estado Sólido |
| Sumario: | Epitaxial YBa_(2)Cu_(3)O_(7) thin films, grown by high-pressure dc sputtering, are irradiated with He^(+) ions at 80 keV with doses between 10^(14) and 10^(15) cm^(-2). Irradiation reduces the critical temperature but it does not modify the carrier concentration. Angle-dependent resistivity is used to show that the mass anisotropy does not change upon irradiation. The melting transition in magnetic fields applied parallel to the c axis is analyzed by I-V critical scaling, and all irradiated and nonirradiated samples show a three-dimensional vortex glass transition with the same critical exponents. The dissipation in the liquid state is analyzed in terms of the activation energy of the magnetoresistance in a perpendicular magnetic field. While as-grown samples show an activation energy depending as 1/H on the applied magnetic field, irradiated samples show a dependence as 1/H^(0.5), characteristic of plastic deformation of vortices. This is discussed in terms of the point disorder introduced by ion irradiation. |
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