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Title: Nonequilibrium structural phase transitions of the vortex lattice in MgB 2

Abstract

We have studied nonequilibrium phase transitions in the vortex lattice in superconducting MgB2, where metastable states are observed in connection with an intrinsically continuous rotation transition. Using small- angle neutron scattering and a stop-motion technique, we investigated the manner in which the metastable vortex lattice returns to the equilibrium state under the influence of an ac magnetic field. This shows a qualitative difference between the supercooled case which undergoes a discontinuous transition and the superheated case where the transition to the equilibrium state is continuous. In both cases, the transition may be described by an activated process, with an activation barrier that increases as the metastable state is suppressed, as previously reported for the supercooled vortex lattice [Louden et al., Phys. Rev. B 99, 060502(R) (2019).] Separate preparations of superheated metastable vortex lattices with different domain populations showed an identical transition toward the equilibrium state. This provides further evidence that the vortex lattice metastability, and the kinetics associated with the transition to the equilibrium state, is governed by nucleation and growth of domains and the associated domain boundaries.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Univ. of Notre Dame, Notre Dame, IN (United States); 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:
1509593
Alternate Identifier(s):
OSTI ID: 1507459; OSTI ID: 1507523
Grant/Contract Number:  
SC0005051; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 14; 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., DeBeer-Schmitt, L., Dewhurst, C. D., Zhigadlo, N. D., and Eskildsen, M. R. Nonequilibrium structural phase transitions of the vortex lattice in MgB2. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.144515.
Louden, E. R., Rastovski, C., DeBeer-Schmitt, L., Dewhurst, C. D., Zhigadlo, N. D., & Eskildsen, M. R. Nonequilibrium structural phase transitions of the vortex lattice in MgB2. United States. doi:10.1103/PhysRevB.99.144515.
Louden, E. R., Rastovski, C., DeBeer-Schmitt, L., Dewhurst, C. D., Zhigadlo, N. D., and Eskildsen, M. R. Mon . "Nonequilibrium structural phase transitions of the vortex lattice in MgB2". United States. doi:10.1103/PhysRevB.99.144515.
@article{osti_1509593,
title = {Nonequilibrium structural phase transitions of the vortex lattice in MgB2},
author = {Louden, E. R. and Rastovski, C. and DeBeer-Schmitt, L. and Dewhurst, C. D. and Zhigadlo, N. D. and Eskildsen, M. R.},
abstractNote = {We have studied nonequilibrium phase transitions in the vortex lattice in superconducting MgB2, where metastable states are observed in connection with an intrinsically continuous rotation transition. Using small- angle neutron scattering and a stop-motion technique, we investigated the manner in which the metastable vortex lattice returns to the equilibrium state under the influence of an ac magnetic field. This shows a qualitative difference between the supercooled case which undergoes a discontinuous transition and the superheated case where the transition to the equilibrium state is continuous. In both cases, the transition may be described by an activated process, with an activation barrier that increases as the metastable state is suppressed, as previously reported for the supercooled vortex lattice [Louden et al., Phys. Rev. B 99, 060502(R) (2019).] Separate preparations of superheated metastable vortex lattices with different domain populations showed an identical transition toward the equilibrium state. This provides further evidence that the vortex lattice metastability, and the kinetics associated with the transition to the equilibrium state, is governed by nucleation and growth of domains and the associated domain boundaries.},
doi = {10.1103/PhysRevB.99.144515},
journal = {Physical Review B},
number = 14,
volume = 99,
place = {United States},
year = {2019},
month = {4}
}

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This content will become publicly available on April 17, 2020
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