Superconductivity in amorphous actinide alloys
Superconductivity has been studied in amorphous binary alloys of actinides containing Co, Fe, and Ni. Amorphous thorium alloys have critical temperatures of up to 3.8 K and electronic properties similar to other transition-metal amorphous alloys. By contrast, amorphous uranium alloys have critical temperatures below 1.0 K and exhibit two unusual electronic properties: (1) The temperature coefficient of resistivity is quite large and negative (< or approx. =-1.3 x 10/sup -4//K) which is generally not found in other low resistivity (<90..mu cap omega.. cm) amorphous alloys containing transition metals; (2) the upper critical-field gradient is the highest observed in bulk amorphous superconductors, up to 44 kOe/K. Based on the resistivity and critical-field gradient we estimate the renormalized density of states to be two to three times that of 4d and 5d amorphous superconductors. The possibility of strong spin fluctuation in these materials is discussed.
- Research Organization:
- Ames Laboratory, Iowa State University, Ames, Iowa 50011
- OSTI ID:
- 6014350
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 31:5; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTINIDE ALLOYS
ALLOY SYSTEMS
ALLOYS
AMORPHOUS STATE
ANGULAR MOMENTUM
BINARY ALLOY SYSTEMS
COBALT ALLOYS
CRITICAL FIELD
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY-LEVEL DENSITY
EXPERIMENTAL DATA
FLUCTUATIONS
INFORMATION
IRON ALLOYS
MAGNETIC FIELDS
NICKEL ALLOYS
NUMERICAL DATA
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
SPIN
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
THORIUM ALLOYS
TRANSITION TEMPERATURE
TYPE-II SUPERCONDUCTORS
ULTRALOW TEMPERATURE
URANIUM ALLOYS
VARIATIONS