Direct transition from the rhombohedral ferroelectric to the paraelectric phase in a (Ba,Sr)TiO3 thin film on a (111)MgO substrate

A. S. Anokhin; Yu. I. Yuzyuk; N. V. Lyanguzov; A. G. Razumnaya; D. V. Stryukov; O. A. Bunina; Yu. I. Golovko; V. B. Shirokov; V. M. Mukhortov; M. El Marssi

doi:10.1209/0295-5075/112/47001

All issues

Volume 112 / No 4 (November 2015)

EPL, 112 4 (2015) 47001

Abstract

Issue		EPL Volume 112, Number 4, November 2015


Article Number		47001
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/112/47001
Published online		26 November 2015

EPL, 112 (2015) 47001

Direct transition from the rhombohedral ferroelectric to the paraelectric phase in a (Ba,Sr)TiO₃ thin film on a (111)MgO substrate

A. S. Anokhin¹^,2, Yu. I. Yuzyuk¹, N. V. Lyanguzov¹, A. G. Razumnaya¹^,4, D. V. Stryukov¹^,2, O. A. Bunina³, Yu. I. Golovko², V. B. Shirokov², V. M. Mukhortov² and M. El Marssi⁴

¹ Faculty of Physics, Southern Federal University - 5, Zorge str., Rostov-on-Don, 344090, Russia
² Southern Scientific Center RAS - 41, Chekhov str., Rostov-on-Don, 344006, Russia
³ Research Institute of Physics, Southern Federal University - 192, Stachki pr., Rostov-on-Don, 344090, Russia
⁴ Laboratoire de Physique de la Matière Condensée, Université de Picardie Jules Verne - 33, rue Saint-Leu, 80039 Amiens Cedex, France

Received: 19 October 2015
Accepted: 12 November 2015

Abstract

A heteroepitaxial (200 nm thick) $\text{Ba}_{0.8}\text{Sr}_{0.2}\text{TiO}_{3}$ (BST) thin film was deposited on a (111)MgO substrate using rf sputtering. X-ray diffraction examinations confirmed epitaxial growth and rhombohedral symmetry of the film ( $a = 0.39616(2)\ \text{nm}$ and $\alpha = 89.52(3)^\circ$ ) at room temperature. Polarized Raman spectra of the film were studied in the temperature range from 100 to 420 K. In contrast to a BST thin film grown on (001)MgO, the observed linear temperature dependence of the squared soft mode frequency suggests the displacive character of the ferroelectric-paraelectric phase transition in a BST thin film on (111)MgO.

PACS: 78.30.-j – Infrared and Raman spectra / 77.55.fe – BaTiO3-based films

© EPLA, 2015

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