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Effects of magnetic history on the ac magnetic susceptibility of granular YBa2Cu3O7-δ superconductors in weak fields

Title
Effects of magnetic history on the ac magnetic susceptibility of granular YBa2Cu3O7-δ superconductors in weak fields
Authors
Lee S.Y.Suh M.A.Bae S.M.Choi S.S.Yang I.-S.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
1995
Journal Title
Physical Review B
ISSN
0163-1829JCR Link
Citation
vol. 51, no. 22, pp. 16302 - 16309
Indexed
SCOPUS scopus
Abstract
We investigate the ac susceptibility of both field-cooled and zero-field-cooled sintered YBa2Cu3O7-δ granular thin slabs and powders in low magnetic fields. The ac susceptibility of the granular thin slabs appears to depend upon the magnetic history for dc fields larger than a certain value, Hdc*, with the existence of the stronger diamagnetic signal (the in-phase part of the ac susceptibility) in the field-cooled case. Our results show that the difference in local flux distributions between the field-cooled case and the zero-field-cooled case exists even for a dc field as low as several Oe, a value much lower than the bulk lower critical field (Hc1). The upper limit of a homogeneous superconducting area determined from Hdc* appears comparable to the average grain size in our granular thin slabs. The existence of Hdc* is attributed to the superconducting glass behavior of granular YBa2Cu3O7-δ with disorder in the intergranular Josephson junctions. © 1995 The American Physical Society.
DOI
10.1103/PhysRevB.51.16302
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자연과학대학 > 물리학전공 > Journal papers
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