Anomalous LO-TO splitting observed by combined IR reflectance and Raman scattering in KTiOPO4 (KTP) single crystal

R. Z. Shneck, U. Argaman, Z. Burshtein

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1 Scopus citations

Abstract

A comprehensive study of vibrational spectra of a KTP single crystal is presented using both Raman scattering and Infrared (IR) reflectance. The 196 mode frequencies are listed according to a revised group theoretical analysis, which addresses the different atomic clusters comprising the crystal unit cell and their symmetry. Inverse LO-TO splitting is suggested to interpret the ν3 vibrational spectra of the PO43- clusters of the A1 symmetry. Theoretical account invokes a proximity between strong and weak polar vibrations and Lyddane-Sachs-Teller's model of LO-TO splitting in a dielectric medium [1]. Many other mode frequencies appear too close to allow unequivocal interpretation of their LO-TO splitting sign.

Original languageEnglish
Article number103385
JournalVibrational Spectroscopy
Volume121
DOIs
StatePublished - 1 Jul 2022

Keywords

  • IR reflectance
  • KTiOPO
  • LO-TO splitting
  • Raman scattering
  • Theoretical mode calculation

ASJC Scopus subject areas

  • Spectroscopy

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