Paramagnetic resonance has been studied for Cr in the $3d^5$ configuration substituting for Cd in CdTe. We find $S=\frac{5}{2}$, $g=1.9997\mathrm{}\pm 0.0003$, $\mathrm{}\left|a\right|=(3.1\mathrm{}\pm 0.6)\times {10}^{-4\mathrm{}}$ ${\mathrm{cm}}^{-1\mathrm{}}$, and $A=(+12.781\mathrm{}\pm 0.005)\times {10}^{-4\mathrm{}}$ ${\mathrm{cm}}^{-1\mathrm{}}$ for ${\mathrm{Cr}}^{53}$. Using electron-nuclear double resonance the complete tensor describing the anisotropic hyperfine coupling with the nearest Cd neighbors has also been determined. Electrical measurements indicate that the Cr acceptor level lies within 0.6 eV of the conduction band edge.

• Received 19 March 1963

DOI:https://doi.org/10.1103/PhysRev.131.601