The European Physical Journal B

, Volume 68, Issue 2, pp 153–160 | Cite as

Optical properties of ZnCr2Se4

Spin-phonon coupling and electronic d-d-like excitations
  • T. RudolfEmail author
  • Ch. Kant
  • F. Mayr
  • M. Schmidt
  • V. Tsurkan
  • J. Deisenhofer
  • A. Loidl
Solid State and Materials


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 transitions of the Cr3+ ions. The unexpected strength of these transitions with d-d character is attributed to a considerable hybridization of the selenium p with the chromium d orbitals.


63.20.-e Phonons in crystal lattices 75.50.Ee Antiferromagnetics 78.30.-j Infrared and Raman spectra 


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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • T. Rudolf
    • 1
    Email author
  • Ch. Kant
    • 1
  • F. Mayr
    • 1
  • M. Schmidt
    • 1
  • V. Tsurkan
    • 1
    • 2
  • J. Deisenhofer
    • 1
  • A. Loidl
    • 1
  1. 1.Experimental Physics V, Center for Electronic Correlations and Magnetism, University of AugsburgAugsburgGermany
  2. 2.Institute of Applied Physics, Academy of Sciences of MoldovaChişinăuRepublic of Moldova

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