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Title: On the origin of `giant moments' in dilute alloys
Authors: Kumar, N.
Sinha, K.P.
Issue Date: 1967
Publisher: IOP Science
Citation: Proceedings of the Physical Society, 1967, Vol.92, p161
Abstract: The occurrence of giant magnetic moments (similar 12 to 14 Bohr magnetons) in some dilute alloys of Fe or Co dissolved in Pd, Pt or mixed 4d-5d series systems is theoretically analysed by taking into account the exchange interaction between the impurity and the spins of neighbouring host atoms, lying within a radius of the order of 8 Å, embracing over 100 atoms. The model Hamiltonian considered includes, in addition to the usual s-d mixing, the mixing between the host localized states (unfilled inner shells) and conduction s-electron states, as well as the exchange interaction mentioned above. Making use of the double-time Green function technique, the net moment associated with the impurity centre and the host neighbours is obtained and found to be a monotonically increasing single-valued function of the matrix susceptibility χ. The matrix susceptibility is attributed to the incompletely filled inner shells (as amply evidenced by the observed paramagnetic temperature dependence of χ for Pt, Pd). A plot of the theoretical curve for the net moment against the host susceptibility is given and is in good agreement with available experimental data.
Description: Restricted Access.
ISSN: 0959-5309
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Copyright: 1967 IOP Science
Appears in Collections:Research Papers (TP)

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