Frustration of magnetic and ferroelectric long-range order in Bi(2)Mn(4/3)Ni(2/3)O(6).
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.
Claridge
John B
JB
Department of Chemistry, University of Liverpool, Robert Robinson Laboratory, Crown Street Liverpool, Liverpool L69 7ZD, UK. j.b.claridge@liverpool.ac.uk
Hughes
Helen
H
Bridges
Craig A
CA
Allix
Mathieu
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Suchomel
Matthew R
MR
Niu
Hongjun
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Kuang
Xiaojun
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Rosseinsky
Matthew J
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Bellido
Natalia
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Grebille
Dominique
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Perez
Olivier
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Simon
Charles
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Pelloquin
Denis
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Blundell
Stephen J
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Lancaster
Tom
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Baker
Peter J
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Pratt
Francis L
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Halasyamani
P Shiv
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