Paramagnetic Meissner effect in high-temperature superconductors

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.4030· OSTI ID:5578934

Braunisch, W; Knauf, N; Bauer, G; Kock, A; Becker, A; Freitag, B; Gruetz, A; Kataev, V; Neuhausen, S; Roden, B; Khomskii, D; Wohlleben, D ^[1]; Bock, J; Preisler, E ^[2]

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1. II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicher Strasse 77, D-50937 Koeln (Germany)
2. Hoechst AG, Werk Knapsack, D-50354 Huerth (Germany)

We have studied the low-field Meissner effect of polycrystalline Bi high-temperature superconductors using a special superconducting-quantum-interference-device magnetometer. In certain samples a surprising feature was observed: Instead of the usual diamagnetic moment a paramagnetic moment develops in the field cooling mode below [ital T][sub [ital c]] for fields [ital H][lt]1 Oe. The data are consistent with orbital paramagnetic moments due to spontaneous currents. Such currents may originate in so-called [pi] contacts in the weak-link network of polycrystalline material. In some of these samples also an anomaly in the low-field microwave absorption was observed, which is obviously correlated with the existence of spontaneous currents.

• OSTI ID: 5578934
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 48:6; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
MEISSNER-OCHSENFELD EFFECT
PARAMAGNETISM
CALCIUM OXIDES
CUPRATES
HIGH-TC SUPERCONDUCTORS
STRONTIUM OXIDES
LEAD ADDITIONS
POLYCRYSTALS
SQUID DEVICES
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTALS
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
LEAD ALLOYS
MAGNETISM
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
SUPERCONDUCTING DEVICES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)