Direct evidence of polar nature of ferroelastic twin boundaries in CaTiO3 obtained by second harmonic generation microscope

Yokota, H. and Usami, H. and Haumont, R. and Hicher, P. and Kaneshiro, J. and Salje, E. K. H. and Uesu, Y. (2014) Direct evidence of polar nature of ferroelastic twin boundaries in CaTiO3 obtained by second harmonic generation microscope. Physical Review B, 89 (14). p. 144109. DOI 10.1103/PhysRevB.89.144109

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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.89.144109

Abstract

The polar nature of twin boundaries (TBs) of inherently nonpolar ferroelastic CaTiO3 is examined by the confocal second harmonic generation (SHG) microscope. Three-dimensional SHG images of samples with the pseudocubic (110) and (1-11) planes confirm that both crystallographically prominent TB (W plane) and nonprominent TB (W' plane) are SHG active and consequently polar. The directions of the electric polarization PS are determined from the anisotropy of SHG intensities. In the W' plane, the SHG polar diagrams are well fitted using the point-group symmetry 2, which reveals that the PS directions parallel to the twofold axis do not lie in the W' plane but are tilted from it. In the W plane, the PS direction lies in the mirror plane of the point-group symmetry m.

Item Type: Article
Uncontrolled Keywords: 2014AREP; IA68;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Physical Review B
Volume: 89
Page Range: p. 144109
Identification Number: 10.1103/PhysRevB.89.144109
Depositing User: Sarah Humbert
Date Deposited: 18 Jul 2014 17:08
Last Modified: 07 Sep 2014 01:52
URI: http://eprints.esc.cam.ac.uk/id/eprint/3080

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