EPR study ofFe3+andCr2+in InP

Abstract

At 4.5 K, ${\mathrm{Fe}}^{3+}$ ($3d^5$) displays a cubic-symmetry EPR spectrum in InP similar to that in related III-V semiconductors, with parameters $g=2.0235\mathrm{}\left(10\right)\mathrm{}$ and $a=+221\mathrm{}\left(2\right)\mathrm{}\times {10}^{-4\mathrm{}}$ ${\mathrm{cm}}^{-1\mathrm{}}$. Optical transitions near 0.75 and 1.13 eV produce transient decreases in the ${\mathrm{Fe}}^{3+}$ signal. The ${\mathrm{Cr}}^{2+}$ ($3d^4$) site symmetry in InP is reduced to tetragonal ($D_{2d}$) by a Jahn-Teller distortion as in GaAs. The ${\mathrm{Cr}}^{2+}$ EPR parameters found are $g_{\parallel }=1.981\mathrm{}\left(3\right)\mathrm{}$, $g_{\perp }=2.010\mathrm{}\left(5\right)\mathrm{}$, $D-a-\frac{2F}{3}=-1.056\mathrm{}\left(1\right)\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$, $\mathrm{}\left|a\right|=0.089\mathrm{}\left(7\right)\mathrm{}$ ${\mathrm{cm}}^{-1\mathrm{}}$.