Depinning frequency in a heavily neutron-irradiated MgB2 sample
arXiv:0809.3324 · doi:10.1016/j.physc.2008.09.002
Abstract
The magnetic-field-induced variations of the microwave surface resistance have been investigated in a heavily neutron-irradiated MgB2 sample, in which the irradiation has caused the merging of the two gaps into a single value. The experimental results have been analyzed in the framework of the Coffey and Clem model. By fitting the experimental data, we have determined the field dependence of the depinning frequency, omega_0, at different values of the temperature. Although the pinning is not particularly effective, the value of omega_0 obtained at low temperatures is considerably higher than that observed in conventional low-temperature superconductors.
15 pages, 6 figures; to be published in Physica C
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Cited by in corpus (3)
- Field-induced suppression of the pi-band superconductivity and magnetic hysteresis in the microwave surface resistance of MgB_2 at temperatures near T_c
- Effect of boron doping in the microwave surface resistance of neutron irradiated melt-textured Y_1.6Ba_2.3Cu_3.3O_7-x samples
- Fluxon dynamics in Li-Al codoped MgB2 by microwave surface resistance measurements