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Title: Critical scaling and aging near the flux-line-depinning transition

Journal Article · · Physical Review B
 [1];  [2]; ORCiD logo [3]; ORCiD logo [3]
  1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Kaizen Analytix, Atlanta, GA (United States); Department of Physics, Virginia Tech
  2. Univ. of Cambridge (United Kingdom)
  3. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Here, we utilize Langevin molecular dynamics simulations to study dynamical critical behavior of magnetic flux lines near the depinning transition in type-II superconductors subject to randomly distributed attractive point defects. We employ a coarse-grained elastic line Hamiltonian for the mutually repulsive vortices and purely relaxational kinetics. In order to infer the stationary-state critical exponents for the continuous nonequilibrium depinning transition at zero temperature T = 0 and at the critical driving current density jc, we explore twoparameter scaling laws for the flux lines’ gyration radius and mean velocity as functions of the two relevant scaling fields T and j - jc. We also investigate critical aging scaling for the two-time height auto-correlation function in the early-time nonequilibrium relaxation regime to independently measure critical exponents. We offer numerical exponent values for the distinct universality classes of noninteracting and repulsive vortices.

Research Organization:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0002308
OSTI ID:
1592824
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 101; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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