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キーワード:
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要旨:
Electron spin resonance measurements in EuFe2As2 single crystals
revealed an absorption spectrum of a single resonance with Dysonian line
shape. Above the spin-density wave (SDW) transition at T-SDW = 190 K the
spectra are isotropic and the Eu spins relax via the conduction
electrons resulting in a Korringa-type increase in 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.
