Displacement Profile of Charge Density Waves and Domain Walls at Critical Depinning

Details Displacement Profile of Charge Density Waves and Domain Walls at Critical Depinning Displacement Profile of Charge Density Waves and Domain Walls at Critical Depinning

2003-04-02

arxiv.org/abs/cond-mat/0304050v1

Phys. Rev. Lett. 92, 257205 (2004)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.92.257205

The influence of a strong surface potential on the critical depinning of an elastic system driven in a random medium is considered. If the surface potential prevents depinning completely the elastic system shows a parabolic displacement profile. Its curvature $\mathcal{C}$ exhibits at zero temperature a pronounced rhombic hysteresis curve of width $2f_c$ with the bulk depinning threshold $f_c$. The hysteresis disappears at non-zero temperatures if the driving force is changed adiabatically. If the surface depins by the applied force or thermal creep, $\mathcal{C}$ is reduced with increasing velocity. The results apply, e.g., to driven magnetic domain walls, flux-line lattices and charge-density waves.

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