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; A. Loidl

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

Superconductivity 2010-01-31 v1

Authors: E. Dengler , J. Deisenhofer , H. -A. Krug von Nidda , Seunghyun Khim , J. S. Kim , Kee Hoon Kim , F. Casper , C. Felser , A. Loidl

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Abstract

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.

Keywords

electron spin resonance EuFe2As2 spin-density wave itinerant electrons localized moments Korringa relaxation anisotropy

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@article{arxiv.0909.2054,
  title  = {Coupling of localized moments and itinerant electrons in EuFe2As2 single crystals studied by Electron Spin Resonance},
  author = {E. Dengler and J. Deisenhofer and H. -A. Krug von Nidda and Seunghyun Khim and J. S. Kim and Kee Hoon Kim and F. Casper and C. Felser and A. Loidl},
  journal= {arXiv preprint arXiv:0909.2054},
  year   = {2010}
}

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4 pages, 4 figures

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

Abstract

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