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Strong reduction of the Korringa relaxation in the spin-density wave regime of EuFe2As2 observed by electron spin resonance

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Citation

Dengler, E., Deisenhofer, J., von Nidda, H.-.-A.-K., Khim, S., Kim, J. S., Kim, K. H., et al. (2010). Strong reduction of the Korringa relaxation in the spin-density wave regime of EuFe2As2 observed by electron spin resonance. Physical Review B, 81(2): 024406, pp. 1-5. doi:10.1103/PhysRevB.81.024406.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0018-9D48-3
Abstract
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.