Physics – Condensed Matter – Superconductivity
Scientific paper
1999-12-14
Phys. Rev. B 63, 054527 (2001)
Physics
Condensed Matter
Superconductivity
4 pages, submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevB.63.054527
The Josephson-plasma and vortex modes in layered superconductors have been studied theoretically for low magnetic fields parallel and perpendicular to layers. The two modes belong to the same lowest-frequency branch of collective-mode spectrum localized near vortices. This is the Josephson-plasma resonance if pancakes are strongly pinned and cannot move. Otherwise the lowest-frequency mode is a vortex mode governed by pancake pinning and the vortex mass. The latter is strongly enhanced by wandering of a vortex line around its average direction. The recently observed jump of the magnetoabsorption-resonance frequency at the vortex phase transition line is interpreted as a transition from the Josephson-plasma to the vortex mode.
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