Superconducting T/sub c/'s and phase relationships of sputter-deposited Nb/sub 3/Ge

Journal Article · Thu Feb 01 04:00:00 EST 1979 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.325990· OSTI ID:6517764

Buitrago, R H; Toth, L E; Goldman, A M

Nb/sub 3/Ge which is fully superconducting above 21 K has been prepared by sputter deposition in a very clean vacuum system at substrate temperatures in the range 500--550 /sup 0/C, or 200 /sup 0/C less than the temperatures needed in other sputtering systems. For a series of compound targets, superconducting T/sub c/'s and metallurgical phases, as established from x-ray diffraction studies, were determined as a function of substrate temperature and argon pressure. Maximum T/sub c/'s were found in films prepared over a narrow range of compositions and substrate temperatures. These conditions coincide with the region of phase stability for the A15. A small amount of oxygen (> or approx. =1.0%) as determined by Auger analysis, was found to be present in high-T/sub c/ films, while lower T/sub c/ films all had less oxygen.

• Research Organization: School of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
• OSTI ID: 6517764
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 50:2; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
ARGON
COHERENT SCATTERING
CRYOGENIC FLUIDS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
FILMS
FLUIDS
GERMANIUM ALLOYS
INTERMETALLIC COMPOUNDS
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
NONMETALS
OXYGEN
PHASE STUDIES
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
RARE GASES
SCATTERING
SPUTTERING
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
TYPE-II SUPERCONDUCTORS
X-RAY DIFFRACTION