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Title: Metal-insulator transition and superconductivity in amorphous molybdenum-germanium alloys

Abstract

The electrical and thermodynamic properties of amorphous molybdenum-germanium alloys in three dimensions were studied as a function of composition was well as temperature. Homogeneous amorphous molybdenum-germanium films were synthesized over a wide compositional range by co-sputtering from pure molybdenum (Mo) and pure germanium (Ge) targets. Physical properties of the films were investigated by electrical conductivity, tunneling, magnetoresistance, low-temperature specific heat measurements, and superconductivity. Experimental results were analyzed by the recent theories of localization and electron interaction. Behavior of the superconducting transition temperature T/sub c/ as a function of concentration can be correlated with the structural results of Kortright. Upper critical fields H/sub c2/ in the Mo-rich region show the enhancement of H/sub c2/ above the Wethamer-Helfand-Hohenberg-Maki (WHHM) theory, which is predicted by the renormalization of the Coulomb interaction due to effects of weak localization. However, H/sub c2/ near the M-I transition shows a behavior below the WHHM fit, which has not been predicted by strong localization theories.

Authors:
Publication Date:
Research Org.:
Stanford Univ., CA (USA)
OSTI Identifier:
7252876
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; GERMANIUM ALLOYS; PHASE STUDIES; SUPERCONDUCTIVITY; MOLYBDENUM ALLOYS; AMORPHOUS STATE; CHEMICAL COMPOSITION; TRANSITION TEMPERATURE; ALLOYS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; 360104* - Metals & Alloys- Physical Properties; 360102 - Metals & Alloys- Structure & Phase Studies

Citation Formats

Yoshizumi, S. Metal-insulator transition and superconductivity in amorphous molybdenum-germanium alloys. United States: N. p., 1986. Web.
Yoshizumi, S. Metal-insulator transition and superconductivity in amorphous molybdenum-germanium alloys. United States.
Yoshizumi, S. Wed . "Metal-insulator transition and superconductivity in amorphous molybdenum-germanium alloys". United States.
@article{osti_7252876,
title = {Metal-insulator transition and superconductivity in amorphous molybdenum-germanium alloys},
author = {Yoshizumi, S},
abstractNote = {The electrical and thermodynamic properties of amorphous molybdenum-germanium alloys in three dimensions were studied as a function of composition was well as temperature. Homogeneous amorphous molybdenum-germanium films were synthesized over a wide compositional range by co-sputtering from pure molybdenum (Mo) and pure germanium (Ge) targets. Physical properties of the films were investigated by electrical conductivity, tunneling, magnetoresistance, low-temperature specific heat measurements, and superconductivity. Experimental results were analyzed by the recent theories of localization and electron interaction. Behavior of the superconducting transition temperature T/sub c/ as a function of concentration can be correlated with the structural results of Kortright. Upper critical fields H/sub c2/ in the Mo-rich region show the enhancement of H/sub c2/ above the Wethamer-Helfand-Hohenberg-Maki (WHHM) theory, which is predicted by the renormalization of the Coulomb interaction due to effects of weak localization. However, H/sub c2/ near the M-I transition shows a behavior below the WHHM fit, which has not been predicted by strong localization theories.},
doi = {},
url = {https://www.osti.gov/biblio/7252876}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

Thesis/Dissertation:
Other availability
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