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Coupling of localized moments and itinerant electrons in EuFe2As2 single crystals studied by Electron Spin Resonance

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arxiv 0909.2054 v1 pith:M4VH4XXK submitted 2009-09-10 cond-mat.supr-con

Coupling of localized moments and itinerant electrons in EuFe2As2 single crystals studied by Electron Spin Resonance

E. Dengler , J. Deisenhofer , H.-A. Krug von Nidda , Seunghyun Khim , J. S. Kim , Kee Hoon Kim , F. Casper , C. Felser
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A. Loidl
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classification cond-mat.supr-con
keywords resonancesinglespincrystalselectronelectronseufe2as2relaxation
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Electron spin resonance measurements in EuFe2As2 single crystals revealed an absorption spectrum of a single resonance with Dysonian lineshape. Above the spin-density wave transition at T_SDW = 190 K the spectra are isotropic and the spin relaxation is strongly coupled to the CEs resulting in a Korringa-like increase of the linewidth. Below T_SDW, a distinct anisotropy develops and the relaxation behavior of the Eu spins changes drastically into one with characteristic properties of a magnetic insulating system, where dipolar and crystal-field interactions dominate. This indicates a spatial confinement of the conduction electrons to the FeAs layers in the SDW state.

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