M A Carpenter et al 2010 J. Phys.: Condens. Matter 22 035403 doi:10.1088/0953-8984/22/3/035403
Elastic relaxations associated with the 
–
transition in LaAlO3: I. Single crystal elastic moduli at room temperature
M A Carpenter1, S V Sinogeikin2, J D Bass2, D L Lakshtanov2,4 and S D Jacobsen3
Show affiliationsValues for all six independent components of the 
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 
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.
- PACS
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81.40.Jj Elasticity and anelasticity, stress-strain relations
78.35.+c Brillouin and Rayleigh scattering; other light scattering
- Subjects
- Dates
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Issue 3 (27 January 2010)
Received 1 August 2009, in final form 14 October 2009
Published 21 December 2009
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