Volume 70, Number 4, May 2005
|Page(s)||520 - 526|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||27 April 2005|
The exchange coupling of dilute and in Cr alloys: Formation of local magnetic clusters
Fachbereich Physik, Freie Universität Berlin - 14195 Berlin, Germany
2 Hahn-Meitner-Institut Berlin GmbH - 14109 Berlin, Germany
3 Instituto de Física da USP - CP 66318, 05315-970 São Paulo, S.P., Brazil
Accepted: 29 March 2005
We have used the atomic specificity and sensitivity of the in-beam perturbed γ-ray angular distribution method to investigate the magnetic behaviour of very dilute implanted into x spin-glass alloys. Distinct magnetic responses due to the different configurations of and nearest neighbours were observed. A single nearest neighbour results in a notable decrease of the magnitude and reversal of the sign of the Curie constant of the paramagnetic implanted . We interpret this as the result of strong antiferromagnetic coupling between adjacent and local moments, leading to the formation of a local magnetic cluster, which remains stable up to the highest temperatures of the measurements (400). A heuristic model using as input data the results of ab initio calculations of coupling constants, magnetic moments and hyperfine fields strongly supports this interpretation.
PACS: 75.20.Hr – Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions / 71.15.Mb – Density functional theory, local density approximation, gradient and other corrections / 76.80.+y – Mössbauer effect; other γ-ray spectroscopy
© EDP Sciences, 2005
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