Transport properties of non-equilibrium metallic alloys
A systematic and quantitative study of upper critical fields, H/sub C2/(T), in disordered bulk alloys with increasing atomic numbers was carried out. They include alloys of Ti-Mo, Ti-Pd, Zr-Mo, Zr-Pd, Zr-Rh, Hf-Mo, and Hf-Ta. A least-squares fitting routine was performed on H/sub C2/(T) with the Werthamer, Helfand, Hohenberg, and Maki theory of dirty superconductors. The localization effects on H/sub C2/(T) were examined by comparing the electronic density of states obtained from specific heat measurements (absence of field-induced delocalization effects) and those derived from fitting critical field data. Measurements on bulk Zr-Ni, Zr-Rh and Hf-Mo alloys gave the first direct confirmation of theoretical predictions on H/sub C2/(T) for the weakly localized 3D systems. To further test the localization theories, magnetoresistance was measured on amorphous Lu-Pd and Lu-Ni alloys. The author also investigated a wide compositional range of U-Fe, U-Co, and U-Ni metallic glasses which contain f-electrons. These uranium glasses exhibit unusual resistivity and superconducting behaviors and have very large upper-critical-field gradients.
- Research Organization:
- Virginia Univ., Charlottesville (USA)
- OSTI ID:
- 6892698
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ATOMIC NUMBER
BINARY ALLOY SYSTEMS
CRITICAL FIELD
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LEAST SQUARE FIT
MAGNETIC FIELDS
MAXIMUM-LIKELIHOOD FIT
MEASURING METHODS
METALLIC GLASSES
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
SUPERCONDUCTORS