Broad-band ellipsometry study of the anisotropic dielectric response of YAlO3
arxiv(2024)
摘要
We present a broad band (THz to UV) ellipsometry study of the anisotropic
dielectric response of the orthorhombic perovskite YAlO3. The ellipsometric
measurements have been performed on YAlO3 crystals with three different surface
cuts and for six high symmetry configurations of the crystal axes with respect
to the plane of incidence of the photons. The obtained data are presented in
terms of the Mueller Matrix elements N, C, and S and their features are
analyzed and discussed with respect to the anisotropy of the dielectric
response tensor. In particular, in the infrared range we have identified all 25
infrared active phonon modes that have been predicted from theoretical studies.
We also discuss a negative refraction effect that naturally occurs in the
vicinity of an anisotropic longitudinal-optical phonon. Moreover, we have
determined the temperature dependence of the phonon parameters between 10 and
330 K. The dielectric response above the phonon range, from about 0.1 to 6.5
eV, is shown to be featureless and characteristic of an insulator with a large
band gap above 6.5 eV and is well described by anisotropic Cauchy model.
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