Soft-mode Raman spectra in K_1−xLi_xTa_1−yNb_yO₃

P. Galinetto INFM and Dipartimento di Fisica «A. Volta», Università degli studi di Pavia, Via Bassi 6, 27100, Pavia, Italy

E. Giulotto INFM and Dipartimento di Fisica «A. Volta», Università degli studi di Pavia, Via Bassi 6, 27100, Pavia, Italy

P. Camagni INFM and Dipartimento di Fisica «A. Volta», Università degli studi di Pavia, Via Bassi 6, 27100, Pavia, Italy

G. Samoggia INFM and Dipartimento di Fisica «A. Volta», Università degli studi di Pavia, Via Bassi 6, 27100, Pavia, Italy

V. A. Trepakov A.F. Ioffe Physical-Technical Institute, Polytekhnicheskaya 26, 194 021, St. Petersburg, Russia

P. P. Syrnikov A.F. Ioffe Physical-Technical Institute, Polytekhnicheskaya 26, 194 021, St. Petersburg, Russia

Abstract

Raman observations in the region of the TO₁ soft mode were performed on samples of K_1−xLi_xTa_1−yNb_yO₃, having x in the range 0.6–1.0 % mol. and y in the range 0.2–0.3 % mol. The analysis of temperature evolution and spectral shape allowed to evidence the spontaneous splitting of the TO₁ mode and its relative stiffness below 50 K. accompanied by an abrupt increase of first order scattering strengths. Such effects are not observed when Li or Nb are separately introduced in the KTaO₃ matrix, at the given concentrations.

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Soft-mode Raman spectra in K_1−xLi_xTa_1−yNb_yO₃

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Soft-mode Raman spectra in K1−xLixTa1−yNbyO3

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Soft-mode Raman spectra in K_1−xLi_xTa_1−yNb_yO₃