Band Edge Energies Pinning in Magnetic Field in Semimagnetic Cd0.7Mn0.3Te |
| L. Barauskaitėa, R. Brazisa, V. Ivanovb and M. Godlewskib
aCenter of Physical Sciences and Technology, A. Goštauto 11, 01108 Vilnius, Lithuania bInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland |
| Received: November 12, 2010; In final form: July 8, 2011 |
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| Results of Cd0.7Mn0.3Te magneto-photoluminescence investigations are analyzed. Photoluminescence was measured in a Voigt geometry at the temperature of 1.6 K. Two models describing radiative transition energy are compared with the experimental results of Cd0.7Mn0.3Te luminescence. The energy of recombination transition, employing the complete form of band states splitting description (term due to the Landau splitting included), shows deviation from experiment at B > 2 T. Two possible reasons of discrepancies from the experiment - exchange interaction constants dependence on magnetic field or band edge energies pinning in magnetic field - are discussed. Band edge energies pinning in magnetic field is related to the hybridization of Mn 3 d5 levels with the band states of the host. We determine the corrected values of exchange interaction constants (N0 α -N0 β/3) at magnetic fields B < 5 T. |
| DOI: 10.12693/APhysPolA.120.1056 PACS numbers: 78.55.Et, 75.50.Pp, 71.70.-d |