Microwave Surface Resistance and Upper-Critical-Field Anisotropy of MgB2 Superconductor

Details Microwave Surface Resistance and Upper-Critical-Field Anisotropy of MgB2 Superconductor Microwave Surface Resistance and Upper-Critical-Field Anisotropy of MgB2 Superconductor

2002-10-08

arxiv.org/abs/cond-mat/0210178v1

Physica C 384 (2003) 11-18

Physics

Condensed Matter

Superconductivity

16 pages, 4 figures, submitted to Physica C

Scientific paper

10.1016/S0921-4534(02)02281-5

The field-induced variations of the microwave surface resistance are investigated in two different samples of powdered MgB2. The experimental results can be justified in the framework of 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. Assuming the angular dependence of the upper critical field expected from the anisotropic Ginzburg-Landau theory, we determine the anisotropy factor by fitting the experimental data of the field dependence of the microwave surface resistance. We show that the anisotropy factor is constant in a range of temperatures of about 3 K below Tc and it takes on different values for the two samples, even though they have similar shape.

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