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.File in questo prodotto:
Non ci sono file associati a questo prodotto.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.