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Author  |
Cejas Bolecek, N.R.; Kolton, A.B.; Konczykowski, M.; Pastoriza, H.; Dominguez, D.; Fasano, Y. |
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Vortex matter freezing in Bi2Sr2CaCu28 samples with a very dense distribution of columnar defects |
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Journal Article |
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2016 |
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Physical Review B |
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Phys. Rev. B |
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93 |
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5 |
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054505 |
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Abstract |
We show that the dynamical freezing of vortex structures nucleated at diluted densities in Bi2Sr2CaCu2O8 samples with a dense distribution of columnar defects, B∼10−2BΦ with BΦ=5kG, results in configurations with liquidlike correlations. We propose a freezing model considering a relaxation dynamics dominated by double-kink excitations driven by the local stresses obtained directly from experimental images. With this model we estimate the relaxation barrier and the freezing temperature. We argue that the low-field frozen vortex structures nucleated in a dense distribution of columnar defects thus correspond to an out-of-equilibrium nonentangled liquid with strongly reduced mobility rather than to a snapshot of a metastable state with divergent activation barriers as, for instance, expected for the Bose-glass phase at equilibrium. |
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American Physical Society |
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BT @ pedrazp @ 10.1103/PhysRevB.93.054505 |
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738 |
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