New cryogenic phase transitions in SrSnO<sub>3</sub>

Singh, Manoj K and Hong, J W and Karan, N K and Jang, Hyun M and Katiyar, R S and Redfern, S. A. T. and Scott, J. F. (2011) New cryogenic phase transitions in SrSnO<sub>3</sub>. Journal of Physics: Condensed Matter, 22 (9). 095901. DOI 10.1088/0953-8984/22/9/095901

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Abstract

Strontium stannate is under study as an ultra-stable dielectric material for microelectronic applications at low temperatures. It is known to have a remarkably temperature-independent dielectric constant from 27 K to room temperature. However, we report anomalies in the Raman spectra, dielectric response, and differential thermal analysis of strontium stannate compatible with a structural phase transition at 160 K. Further anomalies are seen in calorimetric and Raman data (but not dielectric data) that suggest another phase transition at 270 K. A preliminary x-ray powder diffraction study confirms a small change in the pseudo-cubic lattice constant a(T) at the lower transition.

Item Type: Article
Uncontrolled Keywords: 2011AREP; IA63;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 22
Page Range: 095901
Identification Number: 10.1088/0953-8984/22/9/095901
Depositing User: Sarah Humbert
Date Deposited: 12 Aug 2011 16:32
Last Modified: 23 Jul 2013 10:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/2161

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