IPM
30
YEARS OLD

## “School of Physic”

Back to Papers Home
Back to Papers of School of Physic

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.