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Paper   IPM / Physic / 6728
School of Physics
  Title:   Melting of Flux Lines in An Alternating Parallel Current
  Author(s): 
1.  M. Kohandel
2.  M. Kardar
  Status:   Published
  Journal: Phys. Rev. B
  No.:  48
  Vol.:  59
  Year:  1999
  Pages:   9637-9641
  Supported by:  IPM
  Abstract:
We use a Langevin equation to examine the dynamics and fluctuations of a flux line (FL) in the presence of an alternating longitudinal current J||( 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 exactly, and a Lindemann criterion is then used to obtain a nonequilibrium "phase diagram" as a function of the magnitude and frequency of J||( 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 nonzero melting temperature.

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