Proximity coupling effect in NbTi fine-multifilamentary superconducting composites

Journal Article · Mon Aug 20 04:00:00 EDT 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.103429· OSTI ID:6521640

Matsumoto, K ^[1]; Akita, S ^[2]; Tanaka, Y ^[3]; Tsukamoto, O ^[4]

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1. Yokohama R D Laboratories, The Furukawa Electric Co., Ltd., 2-4-3, Okano, Nishi-Ku, Yokohama 220, Japan (JP)
2. Komae Research Laboratory, Central Research Institute of Electric Power Industry, 2-11-1, Iwato-Kita, Komae, Tokyo 201 (Japan)
3. Yokohama R D Laboratories, The Furukawa Electric Co., Ltd., 2-4-3, Okano, Nishi-Ku, Yokohama 220 (Japan)
4. Faculty of Engineering, Yokohama National University, 156, Tokiwadai, Hodogaya-Ku, Yokohama 240 (Japan)

In order to shed light on the proximity effect in fine multifilamentary wires with NbTi filaments, measurements of magnetic susceptibility were conducted at 4.2 K for various values of electrical resistivity of the matrix between filaments, of the distances between filaments, and of the applied magnetic field strength. It was confirmed experimentally that in weak fields (10 mT or less), the critical distance for the occurrence of proximity coupling was several multiples of the characteristic leak distance of Cooper pairs in normally conductive metal, and that when the distances between filaments were large, the breakdown field decreased exponentially, irrespective of the electrical resistivity of the matrix.

• OSTI ID: 6521640
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 57:8; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
COOPER PAIRS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILAMENTS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
PROXIMITY EFFECT
SUPERCONDUCTIVITY
TITANIUM ALLOYS