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

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

2009-09-10

arxiv.org/abs/0909.2054v1

Physical Review B 81, 024406 (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

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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