Publication: Interface barriers for flux motion in high-temperature superconducting superlattices
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2004-04
Authors
Villegas, J. E.
Sefrioui, Zouhair
Varela del Arco, María
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American Physical Society
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Abstract
We study angular dependent magnetoresistance in the vortex-liquid phase of epitaxial YBa2Cu3O7 thin films and YBa_2Cu_3O_7/PrBa_2Cu_3O_7 superlattices. Superlattices were grown with different PrBa_2Cu_3O_7 thickness in order to tune coupling between YBa_2Cu_3O_7 layers. While dissipation of single film and coupled superlattices is scaled with the anisotropic three-dimensional model in the whole angular range, decoupling through PrBa_2Cu_3O_7 spacer breaks down the scaling and yields strong reduction of the dissipation when the magnetic fields are applied up to ±20degrees around the interface direction. Bean-Livingston barriers at the interface are the mechanism which governs this behavior.
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©2004 The American Physical Society.
We acknowledge financial support from Spanish CICYT through Grants Nos. MAT2002-4543 and MAT2000-1468, Grant No. CAM 07N/0008/2001, ESF-Vortex Program, and R. Areces Foundation. One of us (E.M.G.) wants to thank Ministerio de Ciencia y Tecnología for a Ramon y Cajal contract.