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Melting of Flux Lines in an Alternating Parallel Current | | Mohammad Kohandel
; Mehran Kardar
; | | Date: |
13 Aug 1998 | | Subject: | Statistical Mechanics; Superconductivity; Soft Condensed Matter | cond-mat.stat-mech cond-mat.soft cond-mat.supr-con | | Abstract: | We use a Langevin equation to examine the dynamics and fluctuations of a flux line (FL) in the presence of an {it alternating longitudinal current} $J_{parallel}(omega)$. The magnus and dissipative forces are equated to those resulting from line tension, confinement in a harmonic cage by neighboring FLs, parallel current, and noise. The resulting mean-square FL fluctuations are calculated {it exactly}, and a Lindemann criterion is then used to obtain a nonequilibrium `phase diagram’ as a function of the magnitude and frequency of $J_{parallel}(omega)$. For zero frequency, the melting temperature of the mixed phase (a lattice, or the putative "Bose" or "Bragg Glass") vanishes at a limiting current. However, for any finite frequency, there is a non-zero melting temperature. | | Source: | arXiv, cond-mat/9808141 | | Services: | Forum | Review | PDF | Favorites | |
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