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Internal-strain mediated coupling between polar Bi and magnetic Mn ions in the defect-free quadruple-perovskite BiMn3Mn4O12 (Articolo in rivista)
- Type
- Label
- Internal-strain mediated coupling between polar Bi and magnetic Mn ions in the defect-free quadruple-perovskite BiMn3Mn4O12 (Articolo in rivista) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Alternative label
A. Gauzzi, G. Rousse, F. Mezzadri, G. Calestani, G. André, F. Bourée, M. Calicchio, E. Gilioli, R. Cabassi, F. Bolzoni, A. Prodi, P. Bordet, M. Marezio (2011)
Internal-strain mediated coupling between polar Bi and magnetic Mn ions in the defect-free quadruple-perovskite BiMn3Mn4O12
in arXiv
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- A. Gauzzi, G. Rousse, F. Mezzadri, G. Calestani, G. André, F. Bourée, M. Calicchio, E. Gilioli, R. Cabassi, F. Bolzoni, A. Prodi, P. Bordet, M. Marezio (literal)
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- Institut de Mineralogie et de Physique des Milieux Condenses,
Universite Pierre et Marie Curie-Sorbonne Universites and CNRS, 75005 Paris, France
Dipartimento di Chimica - GIAF, Universit`a degli Studi di Parma, 43100 Parma, Italy
Laboratoire Leon Brillouin, CEA-CNRS, 91191 Gif-sur-Yvette, France
Istituto dei Materiali per Elettronica e Magnetismo
Consiglio Nazionale delle Ricerche, Area delle Scienze, 43100 Parma, Italy
Institut Neel-CNRS, 25, rue des Martyrs, 38042 Grenoble, France
CRETA-CNRS, 25, rue des Martyrs, 38042 Grenoble, France (literal)
- Titolo
- Internal-strain mediated coupling between polar Bi and magnetic Mn ions in the defect-free quadruple-perovskite BiMn3Mn4O12 (literal)
- Abstract
- By means of neutron powder diffraction measurements in the 1.5-300 K range, we investigated the
effect of the polar Bi3+ ion on the magnetic ordering of the Mn3+ ions in BiMn3Mn4O12, the counterpart
with quadruple perovskite structure of the simple perovskite BiMnO3. At all temperatures,
the data are consistent with a noncentrosymmetric spacegroup Im which contrasts the centrosym-
metric one I2/m previously reported for the isovalent and isomorphic compound LaMn3Mn4O12.
This difference gives evidence of a Bi3+-induced polarization of the lattice in BiMn3Mn4O12. At
low temperature, the two Mn3+ sublattices of the A? and B sites are found to order antiferromagnetically
(AFM) in an independent fashion at 25 and 55 K, respectively, similarly to the case of
LaMn3Mn4O12. However, both magnetic structures of BiMn3Mn4O12 radically differ from those of
LaMn3Mn4O12. Specifically, in BiMn3Mn4O12 the moments MA? of the A? sites form an anti-body
AFM structure, whilst the moments MB of the B sites result from a large and uniform modulation
±MB,b along the b-axis of the moments MB,ac in the ac-plane of an E-type structure. The
modulation is found to be strikingly correlated with the displacements of the Mn3+ ions induced by
the Bi3+ ions. Our symmetry analysis of this correlation unveils a strong magnetoelastic coupling
between the internal strain field created by the Bi3+ ions and the moment of the Mn3+ ions in the B
sites. We ascribe this phenomenon to the high symmetry of the oxygen sites and to the absence of
oxygen defects, two characteristics of quadruple perovskites not found in simple ones, which prevent
the release of the Bi3+-induced strain through distortions or disorder. This result demonstrates
the possibility of achieving a large magnetoelectric coupling mediated by internal strain in proper
ferroelectrics and suggests a novel concept of internal strain engineering for multiferroics design. (literal)
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