Complete inversion of the Meissner effect in Bi2Sr2CaCu2O8+δ ceramics at ultralow fields

J. Kötzler, M. Baumann, and N. Knauf
Phys. Rev. B 52, 1215 – Published 1 July 1995
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Abstract

Using high-resolution superconducting quantum interference device magnetometry, the field-cooled magnetization MFC of Bi-2212 ceramics with bulk transition temperatures between 62 and 93 K has been investigated from 0.5 mOe to 5 Oe. Upon diamagnetic backgrounds of different magnitude and temperature variation, for all materials a positive contribution to MFC appears, which increases to a formally inverted Meissner effect at the lowest fields, M+=H. The temperature variations of the diamagnetic and inverted responses indicate a common effect of a thermally activated process on both signals.

  • Received 7 February 1995

DOI:https://doi.org/10.1103/PhysRevB.52.1215

©1995 American Physical Society

Authors & Affiliations

J. Kötzler and M. Baumann

  • Institut für Angewandte Physik, Universität Hamburg, D-20355 Hamburg, Federal Republic of Germany

N. Knauf

  • II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 177, D-50937 Köln, Federal Republic of Germany

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Issue

Vol. 52, Iss. 2 — 1 July 1995

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