Field dependence of the Eu2+ spin relaxation in EuFe2−xCoxAs2

The layered compound EuFe2As2 is an interesting model system to investigate the effects of well-defined local Eu2+ 4f states on the itinerant electronic and magnetic properties of the FeAs layers. To address this subject, we investigated the series EuFe2−xCoxAs2 (0.1 x 0.75) by electron spin resonan...

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Bibliographic Details
Published inNew journal of physics Vol. 14; no. 6
Main Authors Garcia, F A, Leithe-Jasper, A, Schnelle, W, Nicklas, M, Rosner, H, Sichelschmidt, J
Format Journal Article
LanguageEnglish
Published IOP Publishing 07.06.2012
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Summary:The layered compound EuFe2As2 is an interesting model system to investigate the effects of well-defined local Eu2+ 4f states on the itinerant electronic and magnetic properties of the FeAs layers. To address this subject, we investigated the series EuFe2−xCoxAs2 (0.1 x 0.75) by electron spin resonance (ESR) of Eu2+ to probe the spin dynamics of the itinerant subsystem. We relate the results to dc-susceptibility measurements and band structure calculations. As a consequence of the weak coupling between the local and itinerant subsystems, we found that the spin relaxation is well understood in terms of the exchange coupling among the local Eu2+ spins. A pronounced field dependence of the Eu2+ spin relaxation demonstrates the direct influence of magnetic fluctuations at the Fe2−xCoxAs2 layers.
ISSN:1367-2630
DOI:10.1088/1367-2630/14/6/063005