Electronic Raman transitions due to the spin Rip of the 3d electrons of Co2
+ in Zn1-xCoxTe and Cd1-xCoxTe (x less than or equal to0.01) are observed a
t h omega (PM)=g(Co2+)mu H-B with g(Co2+)=2.295 +/-0.010 and 2.310 +/-0.002
, respectively. The intensity of Raman electron paramagnetic resonance (Ram
an-EPR) shows strong resonant enhancement when the incident or scattered ph
oton energy coincides with that of a Zeeman component of the free exciton.
Under resonant conditions, the Raman spectra display ''ZnTe-like" (or ''CdT
e-like'') and "CoTe-like" longitudinal optical (LO) phonons in combination
with the spin-flip transitions, a consequence of the Frohlich interaction.
In Zn1-xCoxTe, even the ZnTe-like TO phonon exhibited EPR sidebands but med
iated by the deformation potential; the large p-d spin-spin exchange intera
ction in Co2+-based II-VI diluted magnetic semiconductors is the underlying
microscopic mechanism.