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Title: Structural transition kinetics and activated behavior in the superconducting vortex lattice

Abstract

Using small-angle neutron scattering, we investigated the behavior of a metastable vortex lattice state in MgB 2 as it is driven towards equilibrium by an ac magnetic field. This shows an activated behavior, where the ac field amplitude and cycle count are equivalent to, respectively, an effective “temperature” and “time.” The activation barrier increases as the metastable state is suppressed, corresponding to an aging of the vortex lattice. Furthermore, we find a crossover from a partial to a complete suppression of metastable domains depending on the ac field amplitude, which may empirically be described by a single free parameter. This represents an unconventional kind of collective vortex behavior, not governed by pinning, most likely due to the nucleation and growth of equilibrium vortex lattice domains.

Authors:
 [1];  [1];  [2];  [3];  [4];  [5];  [6];  [1]
  1. Univ. of Notre Dame, IN (United States)
  2. Univ. of Notre Dame, IN (United States); Indiana Univ., Bloomington, IN (United States)
  3. Univ. of Notre Dame, IN (United States); Kent State Univ., Kent, OH (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Inst. Laue-Langevin (ILL), Grenoble (France)
  6. ETH, Zurich (Switzerland); Univ. of Bern (Switzerland)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1509540
Alternate Identifier(s):
OSTI ID: 1493961
Grant/Contract Number:  
AC05-00OR22725; SC0005051
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Louden, E. R., Rastovski, C., Kuhn, S. J., Leishman, A. W. D., DeBeer-Schmitt, L., Dewhurst, C. D., Zhigadlo, N. D., and Eskildsen, M. R. Structural transition kinetics and activated behavior in the superconducting vortex lattice. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.060502.
Louden, E. R., Rastovski, C., Kuhn, S. J., Leishman, A. W. D., DeBeer-Schmitt, L., Dewhurst, C. D., Zhigadlo, N. D., & Eskildsen, M. R. Structural transition kinetics and activated behavior in the superconducting vortex lattice. United States. doi:10.1103/PhysRevB.99.060502.
Louden, E. R., Rastovski, C., Kuhn, S. J., Leishman, A. W. D., DeBeer-Schmitt, L., Dewhurst, C. D., Zhigadlo, N. D., and Eskildsen, M. R. Fri . "Structural transition kinetics and activated behavior in the superconducting vortex lattice". United States. doi:10.1103/PhysRevB.99.060502.
@article{osti_1509540,
title = {Structural transition kinetics and activated behavior in the superconducting vortex lattice},
author = {Louden, E. R. and Rastovski, C. and Kuhn, S. J. and Leishman, A. W. D. and DeBeer-Schmitt, L. and Dewhurst, C. D. and Zhigadlo, N. D. and Eskildsen, M. R.},
abstractNote = {Using small-angle neutron scattering, we investigated the behavior of a metastable vortex lattice state in MgB2 as it is driven towards equilibrium by an ac magnetic field. This shows an activated behavior, where the ac field amplitude and cycle count are equivalent to, respectively, an effective “temperature” and “time.” The activation barrier increases as the metastable state is suppressed, corresponding to an aging of the vortex lattice. Furthermore, we find a crossover from a partial to a complete suppression of metastable domains depending on the ac field amplitude, which may empirically be described by a single free parameter. This represents an unconventional kind of collective vortex behavior, not governed by pinning, most likely due to the nucleation and growth of equilibrium vortex lattice domains.},
doi = {10.1103/PhysRevB.99.060502},
journal = {Physical Review B},
number = 6,
volume = 99,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
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This content will become publicly available on February 8, 2020
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