Magnetic-spin-echo response to a moving vortex lattice in a type-II superconductor
W. G. Clark, F. Lefloch, W. H. Wong
DOI 10.1103/PhysRevB.52.7488 · Physical Review B
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Abstract
We present a model for the reduction of the height of a NMR spin echo caused by driven motion of vortices in an isotropic type-II superconductor. Detailed calculations are carried out for a triangular vortex lattice and a small-amplitude quasistatic sinusoidal rocking of the direction of the applied magnetic field. The model exhibits a scaling behavior in the relevant variables that is independent of the geometry of the sample. It is applied to the case of a thin cylindrical sample with the external field applied perpendicular to the axis of the sample. By fitting the model to experimental measurements, absolute values of the penetration depth λ and the coherence length ξ can be obtained.
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