Complete inversion of the Meissner effect in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} ceramics at ultralow fields

Journal Article · Sat Jul 01 00:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.1215· OSTI ID:76448

Koetzler, J; Baumann, M ^[1]; Knauf, N ^[2]

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1. Institut fuer Angewandte Physik, Universitaet Hamburg, D-20355 Hamburg (Germany)
2. II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicher Strasse 177, D-50937 Koeln (Germany)

Using high-resolution superconducting quantum interference device magnetometry, the field-cooled magnetization {ital M}{sub FC} 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 {ital M}{sub FC} appears, which increases to a formally inverted Meissner effect at the lowest fields, {ital M}{sup +}={ital H}. The temperature variations of the diamagnetic and inverted responses indicate a common effect of a thermally activated process on both signals.

• OSTI ID: 76448
• Journal Information: Physical Review, B: Condensed Matter, Vol. 52, Issue 2; Other Information: PBD: 1 Jul 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HIGH-TC SUPERCONDUCTORS
MEISSNER-OCHSENFELD EFFECT
BISMUTH OXIDES
STRONTIUM OXIDES
CALCIUM OXIDES
COPPER OXIDES
CERAMICS
MAGNETIZATION
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K