Electronic transport properties of La-Al metallic glasses

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5820701

Lu, F C

Electronic transport properties including electrical resistivity, transverse magnetoresistivity, and Hall coefficient were measured for La-Al metallic glasses over a wide temperature range and in a magnetic field up to 15T. For the entire set of glassy alloys, the magnetoconductivity is negative and becomes proportional to ..sqrt..H/T in the high field limit, the zero field conductivity shows a T/sup 1/2/ dependence at low temperatures while the Hall coefficient shows some temperature dependence. These results are analyzed in terms of localization and electron-electron interaction theories and suggest that the interaction effect is the dominant mechanism in determining the low temperature transport properties of these alloys. Moreover, La-Al metallic glasses are superconductors which allows study of the behaviors of amorphous superconductors. In this study, the author also measured the compositional dependence of the superconducting transition temperature and the temperature dependence of the upper critical fields. The superconducting transition temperature decreases as Al concentration increases. All alloys display a linear temperature dependence of upper critical fields in the vicinity of the transition and also show a negative curvature as temperature falls below half of the transition temperature.

• Research Organization: Northwestern Univ., Evanston, IL (USA)
• OSTI ID: 5820701
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
CRITICAL FIELD
ELECTRICAL PROPERTIES
LANTHANUM ALLOYS
MAGNETIC FIELDS
METALLIC GLASSES
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH ALLOYS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE