Magnetically driven ferroelectric atomic displacements of the order of 10(-3) angstrom have been observed in orthorhombic (perovskite like) YMnO3 by a single-crystal synchrotron x-ray diffraction. The refined polar structure shows the characteristic bond alternation driven by the exchange striction in staggered Mn-O-Mn arrays with up arrow up arrow down arrow down arrow type ordering, giving rise to a spontaneous polarization along the a axis. First-principles calculations based on the Berry phase method as well as on the experimentally refined crystal structure can reproduce the observed polarization value.

Magnetically driven ferroelectric atomic displacements in orthorhombic YMnO3

Yamauchi K;Picozzi S;
2011

Abstract

Magnetically driven ferroelectric atomic displacements of the order of 10(-3) angstrom have been observed in orthorhombic (perovskite like) YMnO3 by a single-crystal synchrotron x-ray diffraction. The refined polar structure shows the characteristic bond alternation driven by the exchange striction in staggered Mn-O-Mn arrays with up arrow up arrow down arrow down arrow type ordering, giving rise to a spontaneous polarization along the a axis. First-principles calculations based on the Berry phase method as well as on the experimentally refined crystal structure can reproduce the observed polarization value.
2011
Istituto Superconduttori, materiali innovativi e dispositivi - SPIN
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/278717
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