Abstract
Theoretical investigations of Cr doped GaAs in zinc blende phase are presented in this paper. The robustness of half metallicity of these compounds with correlation to their lattice compressions is discussed. Shifting of Fermi Level with compression of lattice constant is also addressed in this article. Results show that compounds exhibit their half-metallic nature (conductor for spin up state and semiconductor for spin down state) with their lattice compressions up to certain critical lattice constants. Abrupt changes in electronic and magnetic properties are observed for these robust transition lattice constants (RTLCs). These compounds lose their integer magnetic moments 4μB at RTLCs. Calculated RTLC for Ga0.875Cr0.125As is 5.03 A. Possible compressions in lattice constants from their relaxed states while maintaining their half-metallic nature is up to 4 %.
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