Abstract
The flux-flow resistivity and the electronic state inside the vortex core in single crystals of LiFe(As, P) were investigated by microwave-surface impedance. The flux-flow resistivity of these materials increase linearly with the magnetic field, and it is consistent with an isotropic gap nature of materials. However, the gradient is larger than theoretical predictions for superconductors with isotropic gap structure. It is probably the consequence of multiple-bands nature of these materials. We also found that the materials have the moderately clean core, and the mean free path of the quasi-particle inside the vortex core is much shorter than that outside the core, and rather comparable to the core radius. We believe that this is a novel and a universal feature of all superconductors.
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