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Título:
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Vortex liquid entanglement in irradiated YBa_2Cu_3O_7 thin films
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Autores:
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Sefrioui, Zouhair ;
Arias, D. ;
González Herrera, Elvira María ;
León, C. ;
Santamaría Sánchez-Barriga, Jacobo ;
Vicent López, José Luis
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Tipo de documento:
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texto impreso
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Editorial:
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American Physical Society, 2001-02-01
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Electricidad
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Materia = Ciencias: Física: Electromagnetismo
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Materia = Ciencias: Física: Física de materiales
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Materia = Ciencias: Física: Física del estado sólido
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Tipo = Artículo
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Resumen:
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Epitaxial YBa_2Cu_3O_7 thin films, grown by high-pressure de sputtering, an 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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En línea:
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https://eprints.ucm.es/43897/1/Gonz%C3%A1lezH%20EM%2031LIBRE.pdf
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