Elastic and electrical anomalies at low-temperature phase transitions in BiFeO3

Redfern, S. A. T. and Wang, Can and Hong, J. W. and Catalan, G. and Scott, J. F. (2008) Elastic and electrical anomalies at low-temperature phase transitions in BiFeO3. Journal of Physics: Condensed Matter, 20 (45). p. 452205. DOI oi: 10.1088/0953-8984/20/45/452205

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Our measured dielectric constant and mechanical response of multiferroic BiFeO3 indicate four phase transitions below room temperature. Features correlate with those reported at 50 K (from a peak in the zero-field-cooled magnetic susceptibility) and 230 K (from splitting between field-cooled and zero-field-cooled magnetic data; Singh et al 2008 Phys. Rev. B 77 144403), and those at 140 and 200 K (from the magnon light scattering cross section; Singh et al 2008 J. Phys.: Condens. Matter 20 25203). The primary order parameter is not the polarization in any of the low-T transitions. Instead, the transition near 200 K shows strong elastic coupling, while that at 50 K is fundamentally magnetic, but magnetostrictively coupled to the lattice. The low-T phase transitions display glassy behaviour. A further anomaly at 140 K interpreted as spin reorientation (Singh et al 2008 J. Phys.: Condens. Matter 20 25203; Cazayous et al 2008 Phys. Rev. Lett. 101 37601) shows only weakly in dielectric and mechanical studies, indicating that it is predominantly magnetic with little coupling to any of the other order parameters.

Item Type: Article
Uncontrolled Keywords: 08AREP IA57 2008 P
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 20
Page Range: p. 452205
Identification Number: oi: 10.1088/0953-8984/20/45/452205
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:03
Last Modified: 23 Jul 2013 10:08
URI: http://eprints.esc.cam.ac.uk/id/eprint/626

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