Elastic relaxations associated with the Pm\bar 3 m –R\bar 3c transition in LaAlO3: I. Single crystal elastic moduli at room temperature

Carpenter, M. A. and Sinogeikin, S. V. and Bass, J. D. and Lakshtanov, D. L. and Jacobsen, S. D. (2010) Elastic relaxations associated with the Pm\bar 3 m –R\bar 3c transition in LaAlO3: I. Single crystal elastic moduli at room temperature. Journal of Physics: Condensed Matter, 22 (3). 035403. DOI 10.1088/0953-8984/22/3/035403

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Abstract

Values for all six independent components of the \bar 3 m elastic modulus tensor of LaAlO3 perovskite are reported. These were determined by means of Brillouin scattering measurements of acoustic velocities in single crystal plates cut parallel to (110) and (100), as defined with respect to the cubic parent structure, and by pure-mode longitudinal and transverse sound velocity measurements along [100], [110] and [111] directions using GHz pulse-echo ultrasonics. The crystals contained intimate intergrowths of twins arising from the Pm\bar 3 m \leftrightarrow R\bar 3 c transition at higher temperature but, in combination with a careful analysis of twin orientation relationships, the two sets of data have allowed a unique solution to be obtained for individual twin components. The new data set represents an important contribution to the characterization of LaAlO3 single crystals which are widely used as the substrate for a plethora of different thin films with technological applications.

Item Type: Article
Uncontrolled Keywords: 09AREP; IA59;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 22
Page Range: 035403
Identification Number: 10.1088/0953-8984/22/3/035403
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2010 14:25
Last Modified: 23 Jul 2013 09:56
URI: http://eprints.esc.cam.ac.uk/id/eprint/1332

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