Raman inactive phonon-polariton dispersion in quantum paraelectric SrTiO3 crystals studied by FTIR. (17th February 2018)

• Record Type: Journal Article
• Authors: Kojima, Seiji; Maczka, M.
• Is Part Of: Ferroelectrics. Volume 524(2018)
• Page Start: 1
• Page End: 8
• Publication Date: 2018-02-17
• Subjects: SrTiO3 -- FTIR -- phonon-polariton -- Raman inactive; Ferroelectricity -- Periodicals; Ferroelectric crystals -- Periodicals; 537
• DOI: 10.1080/00150193.2018.1431493
• Languages: English
• ISSNs: 0015-0193

Abstract

ABSTRACT: The dispersion relation of Raman inactive phonon-polaritons with T 1u symmetry was studied in quantum paraelectric SrTiO3 with centrosymmetric Pm3¯m in which no Raman active mode is allowed. The reflectivity in the far- and mid-IR regions was measured using a [001] crystal plate by the reflection FT-IR spectroscopy, and the complex refractive index was determined in the broadband frequency range between 30 and 1200 cm −1 . Using these values the dispersion relation of phonon-polariton frequency was discussed using the real and imaginary parts of a polariton wave vector considering the spacial decay of polariton.