Electron Paramagnetic Resonance of Iron in Indium Arsenide

The electron-paramagnetic-resonance spectrum of the $3d^5$ configuration of iron in cubic symmetry has been observed in iron-doped indium arsenide. The spin-Hamiltonian parameters describing this spectrum are $g=2.035\mathrm{}\pm 0.002$ and $a=+(421\mathrm{}\pm 1)\times {10}^{-4\mathrm{}}$ ${\mathrm{cm}}^{-1\mathrm{}}$. The inhomogeneously broadened line is approximately 130 G wide. A comparison is made with the Mössbauer effect of ${\mathrm{Fe}}^{57}$ in InAs studied by Bemski and Fernandes. The results are discussed in terms of charge-transfer configuration admixtures introduced by Fidone and Stevens and elaborated by Watanabe and co-workers.