van Hove singularities and vortex motion in superconductors
نویسندگان
چکیده
When vortices move in a type-II superconductor under the action of an electric current, they interact with the crystal lattice generating acoustic waves. This results in a radiation-friction component to the vortex dissipation, which peaks at values of vortex velocity where there are phonons in the Brillouin zone of the crystal with matching phase and group velocities ~the van Hove condition!. Thus sharp peaks are expected in the currentvoltage characteristic resulting from an enhancement of acoustic power generated by moving vortices.
منابع مشابه
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