Stress tensor dependence of the polarized Raman spectrum of tetragonal barium titanate
作者： Giuseppe Pezzotti , Keisuke Okai , Wenliang Zhu
DOI: 10.1063/1.3672833
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摘要: The stress tensor dependence of the polarized Raman spectrum barium titanate (BaTiO3) tetragonal structure has been theoretically elucidated and phonon deformation potential (PDP) constants its A1(TO) E(TO) vibrational modes measured by means a spectroscopic analysis single-crystalline samples under controlled fields. Two types field were employed: (i) A uniaxial (compressive) generated with loading along different crystallographic axes (ii) biaxial (tensile) stored at tip surface crack propagated across a-plane crystal. This latter enabled us unfolding full set PDP values for mode. However, highly graded (multiaxial) required both rationalizing oblique phonons on crystal orientation applying spatial deconvolution routine based three-dimensional response probe. According to combination o...
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