2009/02/05 by Meng-Bo Luo, Luo, Meng-Bo, Xiao Hu +4
Earth and Planetary Sciences · Physics and Astronomy · #Disordered Systems and Neural Networks (cond-mat.dis-nn) #FOS: Physical sciences #High-pressure geophysics and materials #Physics of Superconductivity and Magnetism #Superconductivity (cond-mat.supr-con) #Theoretical and Computational Physics #cond-mat.dis-nn #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.0902.0858
5 pages, 6 figures
arxiv created 2009/02/05 · openalex publication_date 2009/02/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We simulated the creep motions of flux lines subject to randomly distributed point-like pinning centers. It is found that at low temperatures, the pinning barrier U defined in the Arrhenius-type v-F characteristics increases with decreasing force U(F) ∝ F-μ, as predicted by previous theories. The exponent μ is evaluated as 0.28± 0.02 for the vortex glass and μ≃ 0.5± 0.02 for the Bragg glass (BrG). The latter is in good agreement with the prediction by the scaling theory and the functional-renormalization-group theory on creep, while the former is a new estimate. Within BrG, we find that the pinning barrier is suppressed when temperature is lifted to approximately half of the melting temperature. Characterizations of this new transition at equilibrium are also presented, indicative of a phase transition associated with the replica-symmetry breaking.