Energy Barriers to Motion of Flux Lines in Random Media

Details Energy Barriers to Motion of Flux Lines in Random Media Energy Barriers to Motion of Flux Lines in Random Media

1995-03-03

arxiv.org/abs/cond-mat/9503020v2

Phys. Rev. Lett. 75, 1170 (1995)

Physics

Condensed Matter

4 pages Revtex, 2 figures, to appear in PRL 75, 1170 (1995)

Scientific paper

10.1103/PhysRevLett.75.1170

We propose algorithms for determining both lower and upper bounds for the energy barriers encountered by a flux line in moving through a two-dimensional random potential. Analytical arguments, supported by numerical simulations, suggest that these bounds scale with the length $t$ of the line as $t^{1/3}$ and $t^{1/3}\sqrt{\ln t}$, respectively. This provides the first confirmation of the hypothesis that barriers have the same scaling as the fluctuation in the free energy. \pacs{PACS numbers: 74.60.Ge, 05.70.Ln, 05.40.+j}

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