Physics – Condensed Matter – Materials Science
Scientific paper
2009-01-07
New Journal of Physics 11 (2009) 043019
Physics
Condensed Matter
Materials Science
9 pages, 5 figures
Scientific paper
10.1088/1367-2630/11/4/043019
There has been tremendous research activity in the field of magneto-electric (ME) multiferroics after Kimura et al. [1] showed that antiferromagnetic and ferroelectric order coexist in orthorhom- bically distorted perovskite TbMnO3 and are strongly coupled. It is now generally accepted that ferroelectricity in TbMnO3 is induced by magnetic long range order that breaks the symmetry of the crystal and creates a polar axis [2]. One remaining key question is whether magnetic order can induce ferroelectric polarization that is as large as that of technologically useful materials. We show that ferroelectricity in orthorhombic (o) TmMnO3 is induced by collinear magnetic order, and that the lower limit for its electric polarization is larger than in previously investigated orthorhombic heavy rare-earth manganites. The temperature dependence of the lattice constants provides fur- ther evidence of large spin-lattice coupling effects. Our experiments suggest that the ferroelectric polarization in the orthorhombic perovskites with commensurate magnetic ground states could pass the 1 microC/cm2 threshold, as suggested by theory [3, 4].
Dönni Andreas
Harris Brooks A.
Keller Lukas
Kenzelmann Michel
Kitazawa Hideaki
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