Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-07-18
Eur. Phys. J. B 68, 153 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 6 figures
Scientific paper
10.1140/epjb/e2009-00096-4
We 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.
Deisenhofer Joachim
Kant Ch.
Loidl Alois
Mayr Franz
Rudolf Torsten
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