Grain boundaries in vortex matter

Details Grain boundaries in vortex matter Grain boundaries in vortex matter

2004-12-16

arxiv.org/abs/cond-mat/0412437v2

Physics

Condensed Matter

Statistical Mechanics

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

Scientific paper

10.1103/PhysRevB.72.014505

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.

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