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

被引：17

作者：

Salje, Ekhard K. H. ^{[1
]}

Carpenter, Michael A. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England

来源：

APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 05期

基金：

英国自然环境研究理事会;

关键词：

FERROELASTIC DOMAIN-WALLS; SURFACE-STRUCTURE; TEMPERATURE; WO3;

D O I：

10.1063/1.3622305

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Cooling heterojunctions on LaAlO3 substrates or thick layers of LaAlO3 on SrTiO3 substrates below 820 K lead to a ferroelastic phase transition Pm (3) over barm -> R (3) over barc 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. (C) 2011 American Institute of Physics. [doi:10.1063/1.3622305]

引用

页数：3

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