Abstract
The coupling between magnetic and superconducting degrees of freedom in magnetic superconductors leads to subgap resonances in the I–V characteristic. We study two mechanisms of coupling: the spin-assisted cotunneling (in layered magnetic superconductors) and the interaction mediated by the ac magnetic field of a moving vortex lattice. The latter mechanism we study in both layered and moderately anisotropic superconductors. At resonance conditions the dynamics of vortices in magnetic superconductors changes drastically, resulting in strong peaks in the dc I–V characteristic at voltages at which the washboard frequency of vortex lattice matches the spin wave frequency ω s ( g ) , where g are the reciprocal vortex lattice vectors. We show that for a high enough washboard frequency, peaks in the I–V characteristic in borocarbides and cuprate layered magnetic superconductors are strong enough to be observed on the quasiparticle background. To cite this article: M. Hruška, L.N. Boulaevskii, C. R. Physique 7 (2006).
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