| Issue |
Europhys. Lett.
Volume 70, Number 4, May 2005
|
|
|---|---|---|
| Page(s) | 520 - 526 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2005-10013-7 | |
| Published online | 27 April 2005 | |
The exchange coupling of dilute 
and
in 
Cr
alloys: Formation of local magnetic clusters
1
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
Received:
3
January
2005
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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