Optically induced depinning and Josephson coupling in bulk Bi-Sr-Ca-Cu-O

Bridgelike constrictions were fabricated from polycrystalline bulk Bi-Sr-Ca-Cu-O (BSCCO), and their resistive transition was investigated as a function of temperature. DC current, magnetic field, and optical irradiation. The data are well described by a network of highly damped Josephson junctions....

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Veröffentlicht in:	IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) 1991-03, Vol.27 (2), p.1053-1056
1. Verfasser:	Eidelloth, W.
Format:	Artikel
Sprache:	eng
Schlagworte:	360204 > Ceramics, Cermets, & Refractories-- Physical Properties ALKALINE EARTH METAL COMPOUNDS BISMUTH COMPOUNDS BISMUTH OXIDES CALCIUM COMPOUNDS CALCIUM OXIDES CHALCOGENIDES Condensed matter: electronic structure, electrical, magnetic, and optical properties Conductivity COPPER COMPOUNDS COPPER OXIDES CRITICAL CURRENT CRYSTALS CURRENT DENSITY CURRENTS ELECTRIC CURRENTS Electric variables ELECTRICAL PROPERTIES ELECTROMAGNETIC RADIATION Exact sciences and technology FABRICATION IRRADIATION JOSEPHSON JUNCTIONS JUNCTIONS MAGNETIC FIELDS MAGNETIC FLUX MATERIALS SCIENCE Optical coupling Optical vortices OXIDES OXYGEN COMPOUNDS PHYSICAL PROPERTIES Physics POLYCRYSTALS Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions RADIATIONS STRONTIUM COMPOUNDS STRONTIUM OXIDES SUPERCONDUCTING JUNCTIONS Superconducting transition temperature Superconductivity THERMODYNAMIC PROPERTIES TRANSITION ELEMENT COMPOUNDS 360201 > Ceramics, Cermets, & Refractories-- Preparation & Fabrication TRANSITION TEMPERATURE VISIBLE RADIATION
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Zusammenfassung:	Bridgelike constrictions were fabricated from polycrystalline bulk Bi-Sr-Ca-Cu-O (BSCCO), and their resistive transition was investigated as a function of temperature. DC current, magnetic field, and optical irradiation. The data are well described by a network of highly damped Josephson junctions. Evidence for optically induced depinning of vortices is presented. A threshold value was found for the product of current density and flux density, above which the resistivity increased linearly with applied magnetic field. This behavior is attributed to flux flow, and for conventional superconductors it is described by the Bardeen-Stephen relationship. It is shown that many electrical characteristics predicted by this model resemble flux creep.
ISSN:	0018-9464 1941-0069
DOI:	10.1109/20.133360