Microwave surface resistance and upper-critical-field anisotropy of MgB2 superconductor

Field-induced variations of the microwave surface resistance, R s (H), have been investigated in high-density ceramic MgB 2 . At low temperatures, several peculiarities of the R s (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 MgB 2 , related to the presence of two gaps. On the contrary, the results near T c 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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Fluxon dynamics by microwave surface resistance measurements in MgB2

Gallitto

Bonura

Fricano

et al. 2004

Physica C: Superconductivity

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Numerical study of vortex effects in superconducting microstrip lines

Andrews

Mathew²

2011

Physica C: Superconductivity

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Effect of boron doping in the microwave surface resistance of neutron irradiated melt-textured Y1.6Ba2.3Cu3.3O7−x samples

Gallitto

Duca

Vigni

et al. 2012

Physica C: Superconductivity

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We report on the microwave surface resistance of melt-textured Y 1.6 Ba 2.3 Cu 3.3 O 7−x samples, doped with different amount of B 2 O 3 and, subsequently, irradiated by thermal neutrons at the fluence of 1.476 × 10 17 cm −2 . The microwave surface resistance has been measured as a function of temperature and DC magnetic field. The experimental results are quantitatively discussed in the framework of the Coffey and Clem theory, properly adapted to take into account the d-wave nature of cuprate superconductors. By fitting the experimental data at zero DC field, we have highlighted the effects of the induced defects in the general properties of the samples, including the intergranular region. The analysis of the results obtained at high DC fields allowed us to investigate the fluxon dynamics and deduce the depinning frequency; in particular, we have shown that the addition of B 2 O 3 up to 0.1 wt% increases the effectiveness of the defects to hinder the fluxon motion induced by the microwave current.

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Microwave surface resistance and upper-critical-field anisotropy of MgB2 superconductor

Cited by 4 publications

References 27 publications

Fluxon dynamics by microwave surface resistance measurements in MgB2

Fluxon dynamics by microwave surface resistance measurements in MgB2

Numerical study of vortex effects in superconducting microstrip lines

Effect of boron doping in the microwave surface resistance of neutron irradiated melt-textured Y1.6Ba2.3Cu3.3O7−x samples

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