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

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Garcia,  F. A.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Leithe-Jasper,  A.
Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schnelle,  W.
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Nicklas,  M.
Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Rosner,  H.
Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sichelschmidt,  J.
Jörg Sichelschmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Garcia, F. A., Leithe-Jasper, A., Schnelle, W., Nicklas, M., Rosner, H., & Sichelschmidt, J. (2012). Field dependence of the Eu2+ spin relaxation in EuFe2-xCoxAs2. New Journal of Physics, 14(6): 063005, pp. 063005-1-063005-12. doi:10.1088/1367-2630/14/6/063005.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-20C3-8
Abstract
The layered compound EuFe 2 As 2 is an interesting model system to investigate the effects of well-defined local Eu 2+ 4f states on the itinerant electronic and magnetic properties of the FeAs layers. To address this subject, we investigated the series EuFe 2− x Co x As 2(0.1 ⩽ x ⩽ 0.75) by electron spin resonance (ESR) of Eu 2+ 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 Eu 2+ spins. A pronounced field dependence of the Eu 2+ spin relaxation demonstrates the direct influence of magnetic fluctuations at the Fe 2− x Co x As 2 layers.