Superconducting properties of Ta/Ge multilayers

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:548481

Ruck, B J; Trodahl, H J ^[1]; Brown, S ^[2]

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1. Victoria Univ. of Wellington (New Zealand). Dept. of Physics
2. Univ. of New South Wales, Sydney (Australia). School of Physics

The authors report results of measurements on the superconductor/insulator system consisting of alternating layers of amorphous Ta and amorphous Ge. This system is relatively complex owing to a very thin mixed interface layer in which the pairing interaction is stronger than in the Ta itself. Measurements have now been performed using a dilution refrigerator at temperatures down to 50 mK, and using magnetic fields of up to 14 tesla. The phase diagram of the upper critical field vs temperature has been investigated for various layer thicknesses with the field both parallel and perpendicular to the layers. The results are shown to conform with existing theories on layered superconductors. The non-linear I-V characteristic of these multilayers is also analyzed in zero field for a sample with thin superconducting layers and evidence for a Kosterlitz-Thouless transition is observed.

• OSTI ID: 548481
• Report Number(s): CONF-960163--; ISBN 0-8194-2071-9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRITICAL FIELD
EXPERIMENTAL DATA
GERMANIUM
KOSTERLITZ-THOULESS THEORY
PHASE DIAGRAMS
SUPERCONDUCTIVITY
TANTALUM