AC loss in granular superconducting MgB2 at radio frequencies

Details AC loss in granular superconducting MgB2 at radio frequencies AC loss in granular superconducting MgB2 at radio frequencies

2005-11-29

arxiv.org/abs/cond-mat/0511703v1

Physics

Condensed Matter

Superconductivity

10 pages, 5 figures

Scientific paper

AC losses of granular superconducting MgB2 were measured using non-resonant rf power absorption techniques. The presence of two band-gaps makes the temperature dependent ac loss pattern of MgB2 different from other high Tc superconductors like YBa2Cu3O and BSCCO-2223. Josephson junction decoupling plays a major role in MgB2 polycrystalline samples, both in the presence and absence of magnetic field. We studied the ac loss of MgB2 samples with different crystalline properties, grain sizes and pressures and sintered under different physical and chemical conditions. The effects of frequency and amplitude of ac current on the ac loss are discussed in detail.

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