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Viscous flux motion in anisotropic type-II superconductors in low fields

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2 Author(s)
Z. Hao ; Iowa State Univ., Ames, IA, USA ; J. R. Clem

The Bardeen-Stephen model of viscous flux motion in isotropic type-II superconductors is extended to the anisotropic case characterized by a phenomenological effective mass tensor mij. When the magnetic field is low and the vortex lines are aligned along one of the three principal axes, simple expressions for the viscosity tensor ηij of the viscous flux motion are obtained as functions of mij and the normal state conductivity tensor σij for temperature T close to the critical temperature Tc. For the high-temperature oxide superconductors, the theory predicts that ηb(a)b(c)c(a)≈1:4γ:3γ2, where ηi(i) is the viscosity for the motion along the i-axis of a vortex parallel to the j-axis and γ=√mc/ma is the anisotropy parameter (mi, i=a, b, c, are the principal values of the mass tensor satisfying mambmc )

Published in:

IEEE Transactions on Magnetics  (Volume:27 ,  Issue: 2 )