Abstract
A series of BaTiO3/Ba1 − x Sr x TiO3 (BT/BST) superlattices were prepared by pulsed laser deposition on MgO substrates with a constant period of 80 A (40 A BT and 40 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.
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