Fluxon dynamics by microwave surface resistance measurements in MgB2

Details Fluxon dynamics by microwave surface resistance measurements in MgB2 Fluxon dynamics by microwave surface resistance measurements in MgB2

2003-09-29

arxiv.org/abs/cond-mat/0309654v1

Physica C 404 (2004) 171

Physics

Condensed Matter

Superconductivity

6 pages, 4 figures

Scientific paper

10.1016/j.physc.2003.09.103

Field-induced variations of the microwave surface resistance, Rs(H), have been investigated in high-density ceramic MgB2. At low temperatures, several peculiarities of the Rs(H) curves cannot be justified in the framework of models reported in the literature. We suggest that they are ascribable to the unconventional vortex structure in MgB2, related to the presence of two gaps. On the contrary, the results near Tc can be accounted for by the Coffey and Clem model, with fluxons moving in the flux-flow regime, provided that the anisotropy of the upper critical field is taken into due account.

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