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

T. Rudolf; K. Pucher; F. Mayr; D. Samusi; V. Tsurkan; R. Tidecks; J. Deisenhofer; A. Loidl

doi:10.1103/PhysRevB.72.014450

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

Strongly Correlated Electrons 2007-05-23 v1

Authors: T. Rudolf , K. Pucher , F. Mayr , D. Samusi , V. Tsurkan , R. Tidecks , J. Deisenhofer , A. Loidl

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Abstract

A 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.

Keywords

phonon anomalies charge carrier dynamics infrared spectroscopy magnetic ordering colossal magnetoresistance

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@article{arxiv.cond-mat/0506052,
  title  = {Phonon anomalies and charge dynamics in Fe_{1-x}Cu_{x}Cr_{2}S_{4} single crystals},
  author = {T. Rudolf and K. Pucher and F. Mayr and D. Samusi and V. Tsurkan and R. Tidecks and J. Deisenhofer and A. Loidl},
  journal= {arXiv preprint arXiv:cond-mat/0506052},
  year   = {2007}
}

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8 pages, 6 figures

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

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