Properties of the Bose glass phase in irradiated superconductors near the matching field
Carsten Wengel, Uwe Claus Täuber
DOI 10.1103/PhysRevB.58.6565 · Physical Review B
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Abstract
Structural and transport properties of interacting localized flux lines in the Bose glass phase of irradiated superconductors are studied by means of Monte Carlo simulations near the matching field BΦ, where the densities of vortices and columnar defects are equal. For a completely random columnar pin distribution in the xy plane transverse to the magnetic field, our results show that the repulsive vortex interactions destroy the Mott insulator phase which was predicted to occur at B=BΦ. On the other hand, for ratios of the penetration depth to average defect distance λ/d≲1, characteristic remnants of the Mott insulator singularities remain visible in experimentally accessible quantities as the magnetization, the bulk modulus, and the magnetization relaxation, when B is varied near BΦ. For spatially more regular disorder, e.g., a nearly triangular defect distribution, we find that the Mott insulator phase can survive up to considerably large interaction range λ/d, and may thus be observable in experiments.
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