Anomalous magnetic hysteresis in the microwave surface resistance of MgB2 superconductor

Details Anomalous magnetic hysteresis in the microwave surface resistance of MgB2 superconductor Anomalous magnetic hysteresis in the microwave surface resistance of MgB2 superconductor

2007-09-06

arxiv.org/abs/0709.0840v1

J. Phys.: Conf. Ser. 97 (2008) 012207

Physics

Condensed Matter

Superconductivity

8 pages, 4 embedded eps figures; Proceedings of the 8th EUCAS Conference (16-20 September 2007, Brussels - Belgium)

Scientific paper

10.1088/1742-6596/97/1/012207

We report experimental results of the field-induced variations of the microwave surface resistance in samples of MgB2, produced by different methods. By sweeping the DC magnetic field at increasing and decreasing values, we have detected a magnetic hysteresis that can be ascribed to the different magnetic induction, due to the critical state of the fluxon lattice. The hysteresis observed in the bulk samples has an unusual shape, which cannot be justified in the framework of the critical-state models.

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