SUPERCONDUCTIVITY OF CHROMIUM ALLOYS

Journal Article · Mon Oct 15 04:00:00 EDT 1962 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.128.588· OSTI ID:4794380

Matthias, B T; Geballe, T H; Compton, V B; Corenzwit, E; Hull, Jr, G W

The superconducting properties of Cr--Ru, Cr--Rh, and Cr--Ir alloys were investigated and the transition temperatures were determined as a function of composition and of valence-electron concentration. The Cr-- Ru system contains three superconducting phases all of which have a homogeneity range. A hexagonal close-packed alloy containing 50 at. % Cr has a transition temperature of 1.65 deg K. The sigma-phase type compound Cr/sub 2/Ru has a transition temperature of 2.0 deg K and Cr/sub 3/Ru which crystallizes in the BETA -W type structure becomes superconducting at 3.3 deg K. The hexagonal close-packed alloys in the Cr- -Rh system are superconducting. The transition temperature of an alloy cortaining 70 at. % Cr is 1.1 deg K. Weak ferromagnetism was observed in cold- worked hexagonal close-packed alloys containing approximately 60 at.% Cr. There are two superconducting phases in the Cr--Ir system. A hexagonal close-packed alloy containing 72 at.% Cr has a transition temperature of 0.83 deg K. An alloy with the BETA -W type structure containing 85 at. % Cr becomes superconducting at 0.77 deg K. Both superconductivity and ferromagnetism occur in the Cr--Ir system. The critical conditions for the occurrence of both phenomena are discussed. (auth)

• Research Organization: Bell Telephone Labs., Murray Hill, N.J.
• NSA Number: NSA-17-000568
• OSTI ID: 4794380
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 128; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHROMIUM
CHROMIUM ALLOYS
ELECTRONS
FERROMAGNETIC MATERIALS
INTERMETALLIC COMPOUNDS
IRIDIUM ALLOYS
LATTICES
LOW TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
QUANTITY RATIO
RHODIUM ALLOYS
RUTHENIUM ALLOYS
SUPERCONDUCTIVITY
VALENCE