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Growth and properties of Zn 1– x – y Be x Mn y Se crystals
Author(s) -
Firszt F.,
Łęgowski S.,
Męczyńska H.,
Rozpłoch F.,
Marasek A.,
Strzałkowski K.,
Patyk J.,
Nowak L.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200675130
Subject(s) - photoluminescence , raman spectroscopy , analytical chemistry (journal) , electron paramagnetic resonance , chemistry , exciton , band gap , spectral line , crystal (programming language) , crystallography , materials science , condensed matter physics , nuclear magnetic resonance , physics , optics , optoelectronics , chromatography , astronomy , computer science , programming language
Photoluminescence spectra, photoluminescence‐excitation spectra, Raman and EPR studies were performed in bulk Zn 1– x – y Be x Mn y Se solid solutions grown by the high pressure Bridgman method in the range of composition 0 < x < 0.2, 0 < y < 0.2. For low Mn content photoluminescence spectra at low temperatures consist of exciton, “edge” and deep levels emission bands. The main yellow band (2.05 eV) is due to internal transition in Mn 2+ . The exciton energy gap versus Mn content was determined for Zn 1– x – y Be x Mn y Se samples with Be content x = 0.05. EPR studies show that the g ‐factor is noticeably larger than the g free value indicating a large exchange interaction. The decreasing of g ‐factor with increasing Mn concentration in the investigated samples can be explained as due to increasing of spin ordering. Applying the DPPH as a standard, the concentration of unpaired spins per unit weight of the crystal was estimated. Measured at room temperature Raman spectra consist of ZnSe‐like, MnSe‐like and BeSe‐like transverse (TO), longitudinal (LO), transverse (TA) and longitudinal (LA) phonon modes. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)