Study of soft modes by temperature-derivative first- and second-order Raman spectroscopy

Y. Yacoby*, W. W. Kruhler, S. Just

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A study of soft modes in SrTiO3 using a temperature-derivative Raman technique is reported. The A1g component of the mode which softens towards the phase transition at 108 K has been studied below the phase-transition temperature. The energy of the modes as a function of temperature was followed down to 4 cm-1. The square of the energy of this mode deviates from the Landau behavior for TTc>0.95 and follows a temperature dependence very similar to that of the rotation of the octahedra in SrTiO3. The soft ferroelectric mode has been observed for the first time in second-order Raman. It is shown that two structures in the spectra correspond to a replica of the soft mode and to the simultaneous emission of the soft mode and the absorption of an acoustic mode close to the Γ point.

Original languageEnglish
Pages (from-to)4132-4140
Number of pages9
JournalPhysical Review B
Volume13
Issue number9
DOIs
StatePublished - 1976

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