Journal
PHYSICA B-CONDENSED MATTER
Volume 407, Issue 11, Pages 1685-1688Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2012.01.006
Keywords
Phase competition; Magnetic ferroelectrics; High pressure synthesis
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Funding
- Grants-in-Aid for Scientific Research [24000005] Funding Source: KAKEN
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Perovskite-type manganites exhibit various interesting phenomena arising from complex interplay among spin, charge, orbital, and lattice degrees of freedom. One such example is the keen competition between phases with different spin/charge/orbital orders. Keen competition between antiferromagnetic metal and orbital-ordered insulator is found in the slightly electron-doped regime near Mn4+ state which is stabilized by the high oxygen-pressure condition. Another one is the emergence of ferroelectricity either induced by the magnetic ordering or independently of the magnetic ordering. As the respective examples, perovskite-type YMnO3 and Sr1-xBaxMnO3 are discussed. In the YMnO3, the ferroelectric lattice distortion associated with the E-type spin order is observed for the first time. Displacement-type ferroelectricity with off-center magnetic ions is discovered for Sr0.5Ba0.5MnO3, which shows both large polarization value and strong coupling between ferroelectricity and magnetism. (c) 2012 Elsevier B.V. All rights reserved.
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