| Literature DB >> 19746905 |
John B Claridge1, Helen Hughes, Craig A Bridges, Mathieu Allix, Matthew R Suchomel, Hongjun Niu, Xiaojun Kuang, Matthew J Rosseinsky, Natalia Bellido, Dominique Grebille, Olivier Perez, Charles Simon, Denis Pelloquin, Stephen J Blundell, Tom Lancaster, Peter J Baker, Francis L Pratt, P Shiv Halasyamani.
Abstract
The slight incommensurate modulation of the structure of Bi(2)Mn(4/3)Ni(2/3)O(6) is sufficient to suppress the electrical polarization which arises in commensurate treatments of the structure, due to antiferroelectric coupling of local polar units of over 900 A(3). The incommensurate structure is produced by the competition between ferroelectric Bi lone pair-driven A site displacement, chemical order of Mn and Ni on the B site, and both charge and orbital order at these transition metals. The interplay between the frustrated polar Bi displacements and the frustrated spin order at the B site, induced by positional disorder, produces magnetodielectric coupling between the incommensurately modulated lattice and the spin-glass-like ground state with an unusual relationship between the magnetocapacitance and the applied field.Year: 2009 PMID： 19746905 DOI： 10.1021/ja902424x
Source DB: PubMed Journal: J Am Chem Soc ISSN： 0002-7863 Impact factor: 15.419