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Grain boundaries in vortex matter

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 05 Jul 2005Embargo end date: 01 Jan 2004 Italy, Spain English Publisher:American Physical Society (APS)Journal:Physical Review B, volume 72 (issn: 1098-0121, eissn: 1550-235X,

Authors: Paolo Moretti; M. -Carmen Miguel; Stefano Zapperi;

doi: 10.1103/physrevb.72.014505 , 10.48550/arxiv.cond-mat/0412437

arXiv: http://arxiv.org/abs/cond-mat/0412437

handle: 2445/10923 , 20.500.14243/244338 , 2434/661259

Grain boundaries in vortex matter

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Abstract

We explore the statistical properties of grain boundaries in the vortex polycrystalline phase of type II superconductors. Treating grain boundaries as arrays of dislocations interacting through linear elasticity, we show that self-interaction of a deformed grain boundary is equivalent to a non-local long-range surface tension. This affects the pinning properties of grain boundaries, that are found to be less rough than isolated dislocations. The presence of grain boundaries has an important effect on the transport properties of type II superconductors as we show by numerical simulations: our results indicate that the critical current is higher for a vortex polycrystal than for a regular vortex lattice. Finally, we discuss the possible role of grain boundaries in vortex lattice melting. Through a phenomenological theory we show that melting can be preceded by an intermediate polycrystalline phase.

12 pages, 6 figures. Revised version, accepted for publication in Phys. Rev. B

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Italy, Spain

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Keywords

Flux-line-lattice; high-temperature superconductors; bragg glass phase; II superconductors; neutron-diffraction; single-crystal; elastic theory; transition; metastability; decoration, Superconductivity (cond-mat.supr-con), Superconductivity, Crystallography, Statistical Mechanics (cond-mat.stat-mech), Condensed Matter - Superconductivity, Cristal·lografia, FOS: Physical sciences, Superconductors, Superconductivitat, Condensed Matter - Statistical Mechanics

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