Anomalous magnetic behaviour in non-resonant microwave absorption study of Bi-2212 superconductors

The non-resonant microwave absorption (NRMA) studies in silver doped polycrystalline Bi/sub 2/Sr/sub 2/Ca/sub 1/Cu/sub 2/O/sub 8/ samples have been carried out. The NRMA signal has been observed not only below Tc but also above Tc which is much above the fluctuation regime when the DC magnetic field...

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Veröffentlicht in:	IEEE transactions on magnetics 1999-09, Vol.35 (5), p.4079-4081
Hauptverfasser:	Tripathy, M.R., Srivastava, G.P.
Format:	Artikel
Sprache:	eng
Schlagworte:	ABSORPTION BISMUTH OXIDES CALCIUM OXIDES COMPUTER SIMULATION Condensed matter: electronic structure, electrical, magnetic, and optical properties COPPER OXIDE COPPER OXIDES Direct current DOPED MATERIALS Electromagnetic wave absorption ENERGY LOSSES Exact sciences and technology Fluctuation High temperature superconductors HIGH-TC SUPERCONDUCTORS HYSTERESIS MAGNETIC FIELD Magnetic fields Magnetic hysteresis Magnetic materials Magnetic properties MATERIALS SCIENCE MECHANICAL HYSTERESIS Microwave absorption MICROWAVE RADIATION MICROWAVES PHYSICAL PROPERTIES Physics Properties of type I and type II superconductors Silver SILVER OXIDES STRONTIUM OXIDES Superconducting magnets Superconducting materials Superconducting microwave devices Superconductivity SUPERCONDUCTORS
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Zusammenfassung:	The non-resonant microwave absorption (NRMA) studies in silver doped polycrystalline Bi/sub 2/Sr/sub 2/Ca/sub 1/Cu/sub 2/O/sub 8/ samples have been carried out. The NRMA signal has been observed not only below Tc but also above Tc which is much above the fluctuation regime when the DC magnetic field was swept from -50 G to +50 G through 0G. Anomalous magnetic hysteresis behaviour has been observed where the forward curve lies above the return curve even at lower temperatures. The observed curve has been simulated by taking into consideration the sum of reversible losses as well as irreversible losses using Dulcic and Portis models. This leads to anomalous magnetic hysteresis behaviour as has been observed experimentally.
ISSN:	0018-9464 1941-0069
DOI:	10.1109/20.800761