Disorder and density-of-states effects on the Hall constant in amorphous transition-metal alloys
- Physik-Department, Technische Universitat Munchen, D-8046 Garching, Federal Republic of Germany (DE)
The magnitude of the Hall coefficient {ital R}{sub {ital H}} of amorphous Cu{sub {ital x}}Ti{sub 100{minus}{ital x}} and Cu{sub {ital x}}Zr{sub 100{minus}{ital x}} alloys, prepared by rapid quenching from the melt as well as by sputtering, is found to decrease with increasing temperature. This temperature dependence and the positive sign of {ital R}{sub {ital H}} are discussed with respect to the presence of {ital d} electrons and disorder. Neglecting vertex corrections, we study the effects of a finite spread in the electron's spectral function. Short-range order is included, and hybridization is taken into account in a two-band model. It is shown that under certain conditions lifetime broadening can lead to a positive Hall constant. Below about 25 K the temperature dependence can be described by a {ital T}{sup 1/2} law for the most accurate measurements. This finding gives support to corrections due to electron-electron interaction that are consistent with the low-temperature conductivity and predictions from perturbation theories for coherence effects in disordered conductors.
- OSTI ID:
- 5485957
- Journal Information:
- Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:6; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
AMORPHOUS STATE
COPPER ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-ELECTRON COUPLING
ENERGY-LEVEL DENSITY
HALL EFFECT
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS
ZIRCONIUM ALLOYS