Effects of bond relaxation on the martensitic transition and optical phonons in spontaneously ordered GaInP2
Identifieur interne : 00C385 ( Main/Repository ); précédent : 00C384; suivant : 00C386Effects of bond relaxation on the martensitic transition and optical phonons in spontaneously ordered GaInP2
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Abstract
Strong changes of the Raman intensity induced by the martensitic transition in spontaneously ordered GaInP2 alloys are explained by the triggering of the atom positions between unrelaxed (zinc-blende bond lengths) and relaxed (CuPtB bond lengths) arrangements. We show that these changes reflect a strong dependence of the optical-phonon properties and Raman selection rules of CuPtB-ordered GaInP2 on bond relaxation. Using analysis of the experimental spectra available in the literature we demonstrate that the relaxed and unrelaxed martensitic states can be detected by exciting different crystallographic planes. A strong effect of antiphase boundaries on the Raman spectra of spontaneously ordered GaInP2 is revealed.
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