High frequency elastic losses in LaAlO3 and its importance for LaAlO3/SrTiO3 heterojunctions

Salje, Ekhard K. H. and Carpenter, Michael A. (2011) High frequency elastic losses in LaAlO3 and its importance for LaAlO3/SrTiO3 heterojunctions. Applied Physics Letters, 99. 051907. ISSN 00036951 DOI 10.1063/1.3622305

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Abstract

Cooling heterojunctions on LaAlO3 substrates or thick layers of LaAlO3 on SrTiO3 substrates below 820 K lead to a ferroelastic phase transition Pmmathm→ Rmathc in LaAlO3, with extensive twinning and elastic softening. Twin boundaries add to structural disorder near the heterojunction and generate partially localized carriers. Resonant Ultrasound Spectroscopy data relating to the elastic instability in LaAlO3 show that elastic Cole-Cole circles and the background autocorrelation function follow Vogel-Fulcher behaviour, with a Vogel-Fulcher temperature of 230 K. An extremely low activation energy, 0.02 eV, would promote the formation of highly structured, “glassy” LaAlO3 near the junction.

Item Type: Article
Uncontrolled Keywords: 2011AREP; IA63;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Applied Physics Letters
Volume: 99
Page Range: 051907
Identification Number: 10.1063/1.3622305
Depositing User: Sarah Humbert
Date Deposited: 21 Oct 2011 17:16
Last Modified: 23 Jul 2013 10:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/2205

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