Vortex Viscosity in Magnetic Superconductors Due to Radiation of Spin Waves

Details Vortex Viscosity in Magnetic Superconductors Due to Radiation of Spin Waves Vortex Viscosity in Magnetic Superconductors Due to Radiation of Spin Waves

2010-08-25

arxiv.org/abs/1008.4323v3

Phys. Rev. Lett. 106, 037001 (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.106.037001

In type-II superconductors that contain a lattice of magnetic moments, vortices polarize the magnetic system inducing additional contributions to the vortex mass, vortex viscosity, and vortex-vortex interaction. Extra magnetic viscosity is caused by radiation of spin waves by a moving vortex. Like in the case of Cherenkov radiation, this effect has a characteristic threshold behavior and the resulting vortex viscosity may be comparable to the well-known Bardeen-Stephen contribution. The threshold behavior leads to an anomaly in the current-voltage characteristics, and a drop in dissipation for a current interval that is determined by the magnetic excitation spectrum.

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