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- W2007029216 abstract "Temperature-dependent electron-paramagnetic-resonance experiments have been performed on the arsenic antisite defect in electron-irradiated GaAs. The 4.5% decrease of the central hyperfine coupling constant A upon heating from 4 to 250 K is much too large to be attributable to the thermal expansion of the lattice. We analyze the results in a simple molecular model, and attribute the temperature dependence of A to admixing of excited p-like ${T}_{2}$ state into the s-like ${A}_{1}$ states by the orbit-phonon interaction. This interaction is responsible for a large reduction of the local stiffness coefficient associated with the restoring force after a displacement of the As antisite to an off-center position. These results suggest that, although the isolated As antisite is well behaved, a small perturbation may be sufficient to induce a strong lattice relaxation and metastability, in agreement with a recent model for the EL2 center. The extension of this analysis to the case of the phosphorous antisite defect in GaP suggests that this defect is at the limit of a Jahn-Teller instability." @default.
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- W2007029216 date "1987-10-15" @default.
- W2007029216 modified "2023-10-01" @default.
- W2007029216 title "Temperature dependence of hyperfine coupling of the anion antisite in III-V compounds" @default.
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- W2007029216 doi "https://doi.org/10.1103/physrevb.36.5982" @default.
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