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Resistance Minimum in Dilute “Magnetic” Alloys in the Absence of Impurity Moments
Author(s) -
Nandiniand R.,
Kumar N.
Publication year - 1974
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220630138
Subject(s) - condensed matter physics , degrees of freedom (physics and chemistry) , impurity , degenerate energy levels , magnetic impurity , spin (aerodynamics) , magnetic moment , exchange interaction , electron , chemistry , thermal conduction , physics , kondo effect , ferromagnetism , quantum mechanics , thermodynamics
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.