ANTI-MEISSNER EFFECT AND LOW-FIELD MAGNETIC-RELAXATION IN SINTERED BI-2212
1994 (English)In: Physica. B, Condensed matter, ISSN 0921-4526, Vol. 194, 1549-1550 p.Article in journal (Refereed) Published
A detailed study of the low field magnetic properties of some sintered Bi-2212 samples has been performed. For sufficiently low applied magnetic fields, typically for fields H < 0.2 Oe, the field-cooled magnetisation becomes positive at some temperature below T(C) (anti-Meissner effect), contrary to the usual Meissner effect. The field dependence of this effect is comparable to the predicted behaviour for a system in an orbital glass state. Additionally, the relaxation of the zero-field-cooled magnetisation displays an unexpected field dependence, the relaxation rate S = partial-derivative M/partial-derivative log(t) increases as H(alpha) with alpha almost-equal-to 0.9 at very low fields. In contrast to the behaviour found in sintered YBCO, this result is not accounted for in conventional flux creep models, where the prediction is alpha greater-than-or-equal-to 2.
Place, publisher, year, edition, pages
1994. Vol. 194, 1549-1550 p.
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-195527DOI: 10.1016/0921-4526(94)91274-2OAI: oai:DiVA.org:uu-195527DiVA: diva2:607969
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