Effects of disorder on high-temperature superconductivity in cubic MoN
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
Three types of calculations have been used to help us understand the effects of disorder, alloying, and nonstoichiometry on the superconducting transition temperature T/sub c/ of MoN, predicted to have T/sub c/ = 29 K in the ideal B1 structure. (1) Simple disorder broadening indicates a strong lowering of T/sub c/ which, however, does not account for the very low T/sub c/'s measured in MoN/sub x/ thin films. (2) Rigid-band calculations of the alloy system Nb/sub 1-y/Mo/sub y/N/sub 1.0/ reproduce the measured trend in T/sub c/ for y< or =0.5. (3) Taking explicit account of metal t/sub 2g/--N p bonding in a coherent-potential-approximation model of MoN/sub x/ leads to a semiquantitative understanding of the low measured T/sub c/ values in films in terms of N vacancies, despite the nominal stoichiometry in some of the films.
- Research Organization:
- Naval Research Laboratory, Washington, D.C. 20375-5000
- OSTI ID:
- 5568006
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 31:11; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Mon Jun 01 00:00:00 EDT 1987
·
OSTI ID:6417540
Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BAND THEORY
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
MOLYBDENUM COMPOUNDS
MOLYBDENUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
ORDER PARAMETERS
PARAMETRIC ANALYSIS
PHYSICAL PROPERTIES
PNICTIDES
REFRACTORY METAL COMPOUNDS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BAND THEORY
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
MOLYBDENUM COMPOUNDS
MOLYBDENUM NITRIDES
NITRIDES
NITROGEN COMPOUNDS
ORDER PARAMETERS
PARAMETRIC ANALYSIS
PHYSICAL PROPERTIES
PNICTIDES
REFRACTORY METAL COMPOUNDS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE