Superconducting properties of Nb sub 0. 75 Zr sub 0. 25 -oxide-Nb sub 0. 75 Zr sub 0. 25 tunnel junctions

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Journal of Low Temperature Physics; (United States)

DOI:https://doi.org/10.1007/BF00141565· OSTI ID:5201238

Gambardella, U; Di Gioacchino, D ^[1]; Paterno, G ^[2]; Cirillo, M ^[3]

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1. INFN, Rome (Italy)
2. ENEA-CRE Franscati, Rome (Italy)
3. Univ. di Roma (Italy)

The authors fabricated symmetrical Nb{sub 0.75}Zr{sub 0.25}/Oxide/Nb{sub 0.75}Zr{sub 0.25} tunnel junctions having cross type geometry. The superconducting films constituting the electrodes of the junctions were obtained by RF magnetron sputtering, and the tunnel barrier was grown by natural oxidization in air. From the current-voltage characteristics of the junctions, the temperature dependence of the energy gap of Nb{sub 0.75}Zr{sub 0.25} was measured and compared with BCS-theory results. The magnetic-field diffraction pattern of the Josephson current of the junctions allows evaluation of the penetration depth of the superconducting films. The authors also estimate the surface impedance of the NbZr film by measuring the quality factor of the junctions. They discuss the results within the framework of the realization of superconducting tunnel devices and coatings for superconducting accelerating cavities.

• OSTI ID: 5201238
• Journal Information: Journal of Low Temperature Physics; (United States), Journal Name: Journal of Low Temperature Physics; (United States) Vol. 87:1-2; ISSN 0022-2291; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360107 -- Metals & Alloys-- Superconducting Properties-- (1992-)
665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY GAP
FABRICATION
JOSEPHSON EFFECT
JUNCTIONS
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
TUNNEL EFFECT
ZIRCONIUM ALLOYS