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Resistance Minimum in Dilute Magnetic Alloys in the Absence of Impurity Moments

Nandiniand, R and Kumar, N (1974) Resistance Minimum in Dilute Magnetic Alloys in the Absence of Impurity Moments. In: Physica Status Solidi B, 63 (1). 377 -384.

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A possible mechanism for the resistance minimum in dilute alloys in which the localized impurity states are non-magnetic is suggested. The fact is considered that what is essential to the Kondo-like behaviour is the interaction of the conduction electron spin s with the internal dynamical degrees of freedom of the impurity centre. The necessary internal dynamical degrees of freedom are provided by the dynamical Jahn-Teller effect associated with the degenerate 3d-orbitals of the transition-metal impurities interacting with the surrounding (octahedral) complex of the nearest-neighbour atoms. The fictitious spin I characterizing certain low-lying vibronic states of the system is shown to couple with the conduction electron spin s via s-d mixing and spin-orbit coupling, giving rise to a singular temperature-dependent exchange-like interaction. The resistivity so calculated is in fair agreement with the experimental results of Cape and Hake for Ti containing 0.2 at% of Fe.

Item Type: Journal Article
Publication: Physica Status Solidi B
Publisher: John Wiley and Sons
Additional Information: Copyright of this article belongs to Physica Status Solidi B.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 18 Dec 2009 06:40
Last Modified: 19 Sep 2010 05:47
URI: http://eprints.iisc.ac.in/id/eprint/23851

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