Domain wall generated polarity in ferroelastics: Results from resonance piezoelectric spectroscopy, piezoelectric force microscopy, and optical second harmonic generation measurements in LaAlO3 with twin and tweed microstructures

Yokota, Hiroko, Haines, C. R. S., Matsumoto, Suguru, Hasegawa, Nozomo, Carpenter, Michael A., Heo, Yooun, Marin, Alexe, Salje, E. K. H. and Uesu, Yoshiaki (2020) Domain wall generated polarity in ferroelastics: Results from resonance piezoelectric spectroscopy, piezoelectric force microscopy, and optical second harmonic generation measurements in LaAlO3 with twin and tweed microstructures. Physical Review B, 102 (10). ISSN 1098-0121

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Abstract

Ferroelastic LaAlO3 (space group R3¯c) exists with two different microstructures: twins and tweed. Both microstructures contain electrical dipole moments. Polarity inside ferroelastic twin walls has been shown using two complementary experimental techniques and identical samples. PFM reveals a weak piezoelectric effect at the loci of the domain walls. In tweed samples, the PFM signal is finite but variable in the entire sample. PFM shows that same characteristic tweed microstructure as observed optically. The piezoelectric effect is of a similar magnitude inside twin walls and, space averaged, in the tweed microstructure (and approximately one order of magnitude smaller than in c-oriented PbTiO3 single crystals). Resonance piezoelectric spectroscopy proves that domain walls vibrate under the application of an external driving electric field. The resonance frequency is very close to stress induced vibrations. This is evidence for weak but finite coupling between the local dipole moments in the domain walls and the external electric field. The same coupling and the piezoelectric response are much stronger in the tweed sample. Symmetry breaking by dipolar vectors in a LaAlO3 sample with tweed has been confirmed by the observation of optical second harmonic signals. The noncentrosymmetric point group is identified as 3m in agreement with earlier work on twinned LaAlO3 but in contradiction with predictions of Landau-Ginzburg theory of simple ferroelastic wall structures.

Item Type: Article
Additional Information: Funding Information: H.Y. gratefully acknowledges the JPSJ KAKENHI in Japan for financial support (Grant 17K05489), JST PRESTO Grant JPMJPR19LA, Japan and the Iketani Science and Technology Foundation (Grant 0311045-A). This work was funded by EPSRC Grant EP/P024904/1, which is gratefully acknowledged. RUS facilities in Cambridge were established through grants from the Natural Environment Research Council (Grants NE/B505738/1 and NE/F017081/1) and the Engineering and Physical Sciences Research Council (Grant EP/I036079/1) to M.A.C. M. A. is grateful to the EPSRC for support (Grant EP/P031544/1).
Uncontrolled Keywords: electronic, optical and magnetic materials,condensed matter physics ,/dk/atira/pure/subjectarea/asjc/2500/2504
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Depositing User: LivePure Connector
Date Deposited: 26 Oct 2021 00:41
Last Modified: 02 Nov 2021 01:58
URI: https://ueaeprints.uea.ac.uk/id/eprint/81882
DOI: 10.1103/PhysRevB.102.104117

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