Optical properties of ZnCr2Se4 - Spin-phonon coupling and electronic d-d-like excitations

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dc.creatorRudolf, T.
dc.creatorKant, Ch.
dc.creatorMayr, F.
dc.creatorSchmidt, M.
dc.creatorTsurkan, V.
dc.creatorDeisenhofer, J.
dc.creatorLoidl, A.
dc.date2008-07-18
dc.date2009-04-01
dc.date.accessioned2026-07-07T12:58:20Z
dc.date.available2026-07-07T12:58:20Z
dc.descriptionWe studied the optical properties of antiferromagnetic ZnCr2Se4 by infrared spectroscopy up to 28,000 cm-1 and for temperatures from 5 to 295 K. At the magnetic phase transition at 21 K, one of the four phonon modes reveals a clear splitting of 3 cm-1 as a result of spin-phonon coupling, the other three optical eigenmodes only show shifts of the eigenfrequencies. The antiferromagnetic ordering and the concomitant splitting of the phonon mode can be suppressed in a magnetic field of 7 T. At higher energies we observed a broad excitation band which is dominated by a two-peak-structure at about 18,000 cm-1 and 22,000 cm-1, respectively. These energies are in good agreement with the expected spin-allowed crystal-field transition of the Cr3+ ions. The unexpected strength of these forbidden onsite d-d transitions is attributed to a considerable hybridization of the selenium p with the chromium d orbitals.
dc.description8 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0807.2935
dc.identifierhttp://arxiv.org/abs/0807.2935
dc.identifierEur. Phys. J. B 68, 153 (2009)
dc.identifierdoi:10.1140/epjb/e2009-00096-4
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/225207
dc.subjectStrongly Correlated Electrons
dc.titleOptical properties of ZnCr2Se4 - Spin-phonon coupling and electronic d-d-like excitations
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