MECHANISMS OF LOW-FIELD FLUX-FLOW RESISTANCE IN TYPE-2 SUPERCONDUCTORS

On the basis of the Bardeen-Stephen (BS) theory, the behavior of flux-flow resistivity of type-II superconductors in the low-magnetic-field region and at finite temperatures is studied. The original BS theory does not include the interaction between flux lines. It is shown that if, in the local model, the penetration of the electric fields due to the surface charge distribution of one normal core into the normal-core regions of its neighboring flux lines, in the low-field region, is taken into account, then one obtains a relation between the flux-flow resistivity and the magnetic field, ρfρn=HHc2(o)+γH2Hc2(o)Hc2(T) with γ depending on the structure of the flux-line lattice. This relation agrees qualitatively very well with experimental data. © 1969 The American Physical Society.