Effects of the magnetic orderings on the dynamical conductivity: optical investigations of EuFe$_2$As$_2$ single crystals

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dc.creatorWu, D.
dc.creatorBarišić, N.
dc.creatorDrichko, N.
dc.creatorKaiser, S.
dc.creatorFaridian, A.
dc.creatorDressel, M.
dc.creatorJiang, S.
dc.creatorRen, Z.
dc.creatorLi, L. J.
dc.creatorCao, G. H.
dc.creatorXu, Z. A.
dc.creatorJeevan, H. S.
dc.creatorGegenwart, P.
dc.date2009-03-03
dc.date.accessioned2026-07-07T13:06:42Z
dc.date.available2026-07-07T13:06:42Z
dc.descriptionThe magnetic, transport and optical properties of EuFe$_2$As$_2$ single crystals have been investigated parallel and perpendicular to the $ab$-plane. The anisotropy $ρ_c/ρ_{ab}\approx 8$ depends only slightly on temperature. In both orientations, the spin-density wave transition at $T_{\rm SDW}=189$ K shows up as a considerable increase in the dc resistivity. Susceptibility measurements evidence the magnetic order of the Eu$^{2+}$ moments at $T_N=19$ K with little influence on the electronic transport taking place in the FeAs layers. Polarization-dependent infrared spectroscopy reveals strongly anisotropic optical properties and yields a carrier density of only $4.2\times 10^{21} {\rm cm}^{-3}$ and a bandmass of $m_b=2m_0$. A sizeable Drude contribution is present at all temperatures and narrows upon cooling. Below $T_{\rm SDW}$, the spin-density-wave gap develops in the in-plane optical conductivity; no appreciable change is detected for the perpendicular polarization. Modifications in the phonon features are associated with changes of the electronic properties at $T_{\rm SDW}$. The extended Drude analysis yields a linear behavior of the frequency-dependent scattering rate below $T_{\rm SDW}$, indicating an interaction between the charge carriers and spin fluctuations in the spin-density-wave state.
dc.description10 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/0903.0575
dc.identifierhttp://arxiv.org/abs/0903.0575
dc.identifierPhys. Rev. B 79, 155103 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.155103
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/227865
dc.subjectSuperconductivity
dc.titleEffects of the magnetic orderings on the dynamical conductivity: optical investigations of EuFe$_2$As$_2$ single crystals
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