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

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2 Author(s)
Salje, Ekhard K.H. ; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United Kingdom ; Carpenter, Michael A.

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Cooling heterojunctions on LaAlO3 substrates or thick layers of LaAlO3 on SrTiO3 substrates below 820 K lead to a ferroelastic phase transition Pm3m→ R3c 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.

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Applied Physics Letters  (Volume:99 ,  Issue: 5 )