This article is cited in 16 papers

Lattice dynamics

Raman spectroscopy of BaTiO$_3$/Ba$_{1-x}$Sr$_x$TiO$_3$ superlattices

O. A. Maslova^a, Yu. I. Yuzyuk^a, N. Ortega^b, A. Kumar^b, R. S. Katiyar<sup>b

a</sup> Southern Federal University, Rostov-on-Don
^b Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, USA

Abstract: A series of BaTiO$_3$/Ba$_{1-x}$Sr$_x$TiO$_3$ (BT/BST) superlattices were prepared by pulsed laser deposition on MgO substrates with a constant period of 80 $\mathring{\mathrm{A}}$ (40 $\mathring{\mathrm{A}}$ BT and 40 $\mathring{\mathrm{A}}$ BST) and varying compositions of the BST layer so that the Ba/Sr concentration ratios were 0/100, 30/70, 40/60, 50/50, 60/40, 70/30, 100/0. The soft mode $E$(1TO) of the polarized Raman spectra transformed depending on the Ba/Sr ratio in the BST layer. As the Sr concentration in the BST layers increased from 0 to 100%, the $E$(1TO) soft mode half-width varied from 171 to 103 cm$^{-1}$ and its frequency increased from 31 to 109 cm$^{-1}$ due to the interaction between the epitaxial layers forming the superlattices.

Received: 14.09.2010

 English version: Physics of the Solid State, 2011, 53:5, 1062–1066

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