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Phase diagram of vortex matter in layered superconductors with tilted columnar pinning centers

Dasgupta, Chandan and Valls, Oriol T (2009) Phase diagram of vortex matter in layered superconductors with tilted columnar pinning centers. In: Physical Review B, 80 (9). 094517-1.

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We study the vortex matter phase diagram of a layered superconductor in the presence of columnar pinning defects, tilted with respect to the normal to the layers. We use numerical minimization of the free energy written as a functional of the time-averaged vortex density of the Ramakrishnan-Yussouff form, supplemented by the appropriate pinning potential. We study the case where the pin density is smaller than the areal vortex density. At lower pin concentrations, we find, for temperatures of the order of the melting temperature of the unpinned lattice, a Bose glass type phase which at lower temperatures converts, via a first-order transition, to a Bragg glass, while, at higher temperatures, it crosses over to an interstitial liquid. At somewhat higher concentrations, no transition to a Bragg glass is found even at the lowest temperatures studied. While qualitatively the behavior we find is similar to that obtained using the same procedures for columnar pins normal to the layers, there are important and observable quantitative differences, which we discuss.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: Copyright of this article belongs to American Physical Society, 2009.
Keywords: bismuth compounds; calcium compounds; flux pinning; high-temperature superconductors; interstitials; phase diagrams; strontium compounds
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 20 Dec 2009 08:40
Last Modified: 19 Sep 2010 05:50
URI: http://eprints.iisc.ac.in/id/eprint/24520

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