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Hysteresis in AC magnetic susceptibility and onset of field penetration in bulk granular YBa2Cu3Oy superconductors

โœ Scribed by C.Y. Lee; L.W. Song; Y.H. Kao

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
455 KB
Volume
191
Category
Article
ISSN
0921-4534

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โœฆ Synopsis

Hysteresis in AC magnetic susceptibility of bulk granular YBa2Cu303, superconductors was invest:gated as a function of DC magnetic field and temperature. The pronounced irreversible behavior in ~.he tow field field regime allows a new approach to determine the onset of magnetic field penetration and an averaged lower critical field of the sor, ercovducting grains. A complete field-screening state in the intergranular region was observed for the first time. The temperature dependence of the lower critical field in both the intra-and intergranular regions is consistent with the BCS pairing mechanism wit.~ a modified gap parameter 2A(0) = 7.0 kTo

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