Physical Review B 75,15 (2007) 155206;
Raman electron paramagnetic resonance (Raman-EPR) of the transitions due to the spin flip of the 3d electrons of Cr+ in Zn1-xCrxTe and Cd1-xCrxTe is observed at h omega(PM)=g(Cr+)mu B-B with g(Cr+)=2.0041 +/- 0.0095 and 2.0039 +/- 0.0093, respectively. The appearance of Raman lines at omega(LO)+/- n omega(PM), n=1, 2, and 3 results from the strong Frohlich interaction with the zone-center longitudinal-optic phonon. The intensity of the Raman-EPR of Cr+ can be enhanced through the photogeneration process by simultaneous illumination with photons having an energy close to the excitonic band gap; photoluminescence spectra reveal signatures of excitons bound to Cr+ acceptors in Zn1-xCrxTe specimens. The resonance profile of Cr+ Raman-EPR shows that the strong resonant enhancement is mediated via an exciton bound to a neutral acceptor.
Physics, Condensed Matter
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