Self-doping effects in cobalt silicide CoSi: Electrical, magnetic, elastic, and thermodynamic properties

We report electrical, magnetic, elastic, and thermodynamic properties of CoSi. A low resistivity residual ratio and tendency of the resistivity to saturate near room temperature identify CoSi as a disordered metal, which nevertheless reveals the clear presence of T super(2) contribution of nonmagnet...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-08, Vol.86 (6), Article 064433
Main Authors: Stishov, Sergei M., Petrova, Alla E., Sidorov, Vladimir A., Menzel, Dirk
Format: Article
Language:English
Subjects:
Condensed matter
Constants
Elastic constants
Electrical resistivity
Magnetic moment
Magnetic properties
Position (location)
Thermodynamic properties
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Summary:We report electrical, magnetic, elastic, and thermodynamic properties of CoSi. A low resistivity residual ratio and tendency of the resistivity to saturate near room temperature identify CoSi as a disordered metal, which nevertheless reveals the clear presence of T super(2) contribution of nonmagnetic nature below ~ 30 K. The Sommerfeld constant of CoSi, following from heat capacity measurements, does not show any enhancement over values typical of simple metals. The magnetic susceptibility of CoSi changes from diamagnetic at high temperature to paramagnetic at temperatures below ~ 25 K, indicating the existence of local magnetic moments. The elastic moduli of CoSi show an anomalous decrease on cooling. An explanation of these phenomena is based on the concept of electron localization with formation of local magnetic moments. These phenomena probably arise as a result of a self-doping effect due to the polyvalent character of Co and the nonstoichiometric nature of CoSi.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.86.064433