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Finite-size effects in vortex localization
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DOI：10.1103/PhysRevB.57.8571.png)
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摘要
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The equilibrium properties of flux lines pinned by columnar disorder are studied, using the analogy with the time evolution of a diffusing scalar density in a randomly amplifying medium. Near H-c1, the physical features of the vortices in the localized phase are shown to be determined by the density of states near the band edge. As a result, H-c1 is inversely proportional to the logarithm of the sample size, and the screening length of the perpendicular magnetic field decreases with temperature. For large tilt the extended ground state turns out to wander in the plane perpendicular to the defects with exponents corresponding to a directed polymer in a random medium, and the energy difference between two competing metastable states in this case is extensive. The divergence of the effective potential associated with strong pinning centers as the tilt approaches its critical value is discussed as well.
Keyword:
HIGH-TEMPERATURE SUPERCONDUCTORS
DEFECTS
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期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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Effect of field tilting on the dynamics of vortices pinned by correlated disorder.png)
PHYSICAL REVIEW B
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PHYSICAL REVIEW BIF3.7
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