Phonon anomalies and charge dynamics in Fe_{1-x}Cu_{x}Cr_{2}S_{4} single crystals

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dc.creatorRudolf, T.
dc.creatorPucher, K.
dc.creatorMayr, F.
dc.creatorSamusi, D.
dc.creatorTsurkan, V.
dc.creatorTidecks, R.
dc.creatorDeisenhofer, J.
dc.creatorLoidl, A.
dc.date2005-06-02
dc.date.accessioned2026-07-07T07:45:56Z
dc.date.available2026-07-07T07:45:56Z
dc.descriptionA detailed investigation of phonon excitations and charge carrier dynamics in single crystals of Fe_{1-x}Cu_{x}Cr_{2}S_{4} (x = 0, 0.2, 0.4, 0.5) has been performed by using infrared spectroscopy. In FeCr_{2}S_{4} the phonon eigenmodes are strongly affected by the onset of magnetic order. Despite enhanced screening effects, a continuous evolution of the phonon excitations can be observed in the doped compounds with x = 0.2 (metallic) and x = 0.4, 0.5 (bad metals), but the effect of magnetic ordering on the phonons is strongly reduced compared to x = 0. The Drude-like charge-carrier contribution to the optical conductivity in the doped samples indicates that the colossal magneto-resistance effect results from the suppression of spin-disorder scattering.
dc.description8 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0506052
dc.identifierhttp://arxiv.org/abs/cond-mat/0506052
dc.identifierPhys. Rev. B 72, 014450 (2005)
dc.identifierdoi:10.1103/PhysRevB.72.014450
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/123666
dc.subjectStrongly Correlated Electrons
dc.titlePhonon anomalies and charge dynamics in Fe_{1-x}Cu_{x}Cr_{2}S_{4} single crystals
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