Saw measurements on a Nb film and an YBa sub 2 Cu sub 3 O sub 7 film

Conference · Fri Mar 01 04:00:00 EST 1991 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:5878979

Baum, H P; Barma, B K; Levy, M ^[1]; Gaveler, J ^[2]; Hohler, A ^[3]

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1. Wisconsin Univ., Milwaukee, WI (United States)
2. Westinghouse Electric Corp., Pittsburgh, PA (United States). Research and Development Center
3. Inst. fuer Angewandte Physik Henrich-Buff-Ring 16, D-6300 Giessen (DE)

This paper reports on surface acoustic wave attenuation measurements performed in a screen room on a superconducting film of Nb at 659 MHz and on a high T{sub c} film of YBa{sub 2}Cu{sub 3}O{sub 7} at 168 MHz. The attenuation in the Nb film is due to electron-phonon interaction and follows a BCS curve in the superconducting state. The measured change in attenuation was 0.8 dB/cm giving an electron mean free path which is about twice as large as the value obtained from the sheet resistivity of this {omega}/{open square}, and the observed change in attenuation at T{sub c} = 87 K was 0.18 dB/cm. A percolation model is proposed for describing the behavior of both the attenuation and the sheet resistivity in the superconducting state.

• OSTI ID: 5878979
• Report Number(s): CONF-900944--
• Conference Information: Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Journal Volume: 27:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
665411 -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACOUSTIC TESTING
ALKALINE EARTH METAL COMPOUNDS
ATTENUATION
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELEMENTS
FILMS
MATERIALS TESTING
MEAN FREE PATH
METALS
NIOBIUM
NONDESTRUCTIVE TESTING
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTING FILMS
SURFACE PROPERTIES
TESTING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES