Crystal and magnetic structures of hexagonal YMnO \textrm3

Howard, Christopher J. and Campbell, Branton J. and Stokes, Harold T. and Carpenter, Michael A. and Thomson, Richard I. (2013) Crystal and magnetic structures of hexagonal YMnO \textrm3. Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials, 69 (6). pp. 534-540. DOI https://doi.org/10.1107/S205251921302993X

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Abstract

The available data on the structural and magnetic transitions in multiferroic hexagonal YMnO3 have been reviewed, first making use of the computer programs from the group theoretical ISOTROPY software suite to list possible crystal and magnetic structures, then taking into account the capability of neutron diffraction and other physical methods to distinguish them. This leads to a clear view of the transformation sequence, as follows. Hexagonal YMnO3 is paraelectric in P63/mmc at elevated temperatures, and undergoes a single structural transition on cooling through 1250 K to a ferrielectric phase in P63cm that is retained through room temperature. At a much lower temperature, 70 K, there is a magnetic transition from paramagnetic to a triangular antiferromagnetic arrangement, most likely with symmetry P63'cm'. Comment is made on the unusual coupling of ferroelectric and magnetic domains reported to occur in this material, as well as on the so-called `giant magneto-elastic' effect.

Item Type:	Article
Uncontrolled Keywords:	2014AREP; IA67;
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials
Volume:	69
Page Range:	pp. 534-540
Identification Number:	https://doi.org/10.1107/S205251921302993X
Depositing User:	Sarah Humbert
Date Deposited:	31 Jan 2014 18:19
Last Modified:	18 Feb 2014 17:29
URI:	http://eprints.esc.cam.ac.uk/id/eprint/2953

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