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Luminescence of Cd0.7Mn0.3Te Crystals in Transverse Magnetic Field

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Brazis R., Barauskaitė L., Ivanov V., Godlewski M.
Acta Physica Polonica A
|
2006
|
vol. 109
|
issue 6
731-741
EN
Photoluminescence of cleaved Cd0.7Mn0.3Te crystals is studied at T≈1.6 K at the normal- and oblique (45º) incidence of the pumping Ar laser beam (λ=488 nm) in magnetic fields -7≤ B≤7 T in the Voigt geometry. At B=0, photoluminescence maximum is found at 2.0819 eV at normal incidence (and backward emission) whereas the oblique incidence and emission shows photoluminescence maximum intensity at 2.0536 eV. The red shift of photoluminescence maximum position with the rise in B is observed and the results are found to be in good agreement with sp-d exchange interaction model for the oblique incidence case. Backward emitted photoluminescence line is found to narrow from 26.2 to 23.5 meV with the rise in B from 0 to 7 T. Alloy disorder contribution exhibits opposite trend to broaden, as is calculated on the basis of the matrix of the energy gap dependence on x and B. Therefore the observed photoluminescence line narrowing is assigned to the suppression of magnetic fluctuation in magnetic field. A linear size of magnetic fluctuation is estimated to be about 1/5 of the free exciton diameter. Photoluminescence maximum position difference in the normal- and oblique incidence cases is assigned to polaritons.
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Band Edge Energies Pinning in Magnetic Field in Semimagnetic Cd_{0.7}Mn_{0.3}Te

100%
Barauskaitė L., Brazis R., Ivanov V., Godlewski M.
Acta Physica Polonica A
|
2011
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vol. 120
|
issue 6
1056-1060
EN
Results of Cd_{0.7}Mn_{0.3}Te 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 Cd_{0.7}Mn_{0.3}Te 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 d^{5} levels with the band states of the host. We determine the corrected values of exchange interaction constants (N_0 α -N_0 β/3) at magnetic fields B < 5 T.
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