Structural anomalies at the magnetic transition in centrosymmetric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>BiMnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Montanari, Erica; Calestani, G.; Righi, Lara; Gilioli, E.; Bolzoni, F.; Knight, Kevin S.; Radaelli, P. G.

doi:10.1103/physrevb.75.220101

Cited by 82 publications

(98 citation statements)

References 12 publications

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“…If so, BiMnO 3 should be an antiferroelectric, rather than ferroelectric material. This finding was further confirmed in the neutron powder diffraction experiments by Montanari et al [16] who also concluded that the crystal structure of BiMnO 3 is better described by the C2/c group in a wide range of temperatures (10 T 295 K) and magnetic fields (0 H 10 T). In this respect, it is important to note that there are many objective difficulties related to the determination of the crystal structure of BiMnO 3 [17] 5 .…”

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confidence: 73%

Orbital ordering and magnetic interactions in BiMnO₃

Solovyev

Pchelkina

2008

New J. Phys.

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Abstract. This work is devoted to the analysis of the orbital ordering patterns and associated interatomic magnetic interactions in the centrosymmetric monoclinic structures of BiMnO 3 , which have been recently determined experimentally. First, we set up an effective lattice fermion model for the manganese 3d bands and derive parameters of this model from first-principles electronic structure calculations. Then, we solve this model in terms of the mean-field Hartree-Fock method and obtain parameters of interatomic magnetic interactions between Mn ions. We argue that although the nearest-neighbor interactions favor the ferromagnetism, they compete with the longer range antiferromagnetic (AFM) interactions, the existence of which is directly related to the peculiar geometry of the orbital ordering pattern realized in BiMnO 3 below 474 K. These AFM interactions favor an AFM alignment, which breaks the inversion symmetry. The formation of the AFM phase is additionally assisted by the orbital degrees of freedom, which tend to adjust the nearest-neighbor magnetic interactions in the direction which further stabilizes this phase. We propose that the multiferroelectric behavior, which was observed in BiMnO 3 , may be related to the emergence of the AFM phase under certain conditions.

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confidence: 73%

Orbital ordering and magnetic interactions in BiMnO₃

Solovyev

Pchelkina

2008

New J. Phys.

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“…A purely «electronic mechanism» of magnetoelectricity (here we use the terminology of a recent review paper [5]) does not occur so often in nature while there are many multiferroic materials where magnetoelectric coupling is associated with lattice distortions [6][7][8][9][10]. So, further investigations and a theoretical analysis of the Cu 2 OSeO 3 system are needed for the purpose of understanding its unusual magnetoelectric coupling mechanism.…”

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confidence: 99%

Magnetoelectricity in the ferrimagnetic Cu2OSeO3: symmetry analysis and Raman scattering study

Gnezdilov

Lamonova

Pashkevich

et al. 2010

Low Temperature Physics

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We report Raman scattering studies and magneto/structural symmetry analysis of the many sublattices ferrimagnet Cu 2 OSeO 3 with a cubic symmetry and a linear magnetoelectric effect. There is no spectroscopic evidence for structural lattice distortions below T C = 60 K, which are expected due to magnetoelectric coupling. Using symmetry arguments we explain this observation by considering a special type of ferrimagnetic ground state which does not generate a spontaneous electric polarization. Interestingly, Raman scattering shows a strong increase of electric polarization of media through a dynamic magnetoelectric effect as a remarkable enhancement of the scattering intensity below T C . New lines of purely magnetic origin have been detected in the magnetically ordered state. A part of them are attributed as scattering on exchange magnons. Using this observation and further symmetry considerations we argue for strong Dzyaloshinskii-Moriya interaction existing in the Cu 2 OSeO 3 .

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“…However, the occurrence of ferroelectricity in this system has been challenged by a comparative analysis of electron and neutron diffraction data showing that polycrystalline BMO belongs instead to the centrosymmetric monoclinic C2/c space group, thus incompatible with proper ferroelectricity. 4,5 More recently, Solovyev and Pchelkina 6 proposed improper ferroelectricity of BiMnO 3 due to the competition between the ferromagnetic phase and a hidden antiferromagnetic phase, characterized by canted Mn spins and a threedimensional (3D) orbital order arrangement. The balance between these complex states could be tuned by applying external pressure 7 or epitaxial strain.…”

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Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films

Luca¹,

Preziosi²,

Chiarella³

et al. 2013

Applied Physics Letters

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We studied the ferroelectric and ferromagnetic properties of compressive strained and unstrained BiMnO3 thin films grown by rf-magnetron sputtering. BiMnO3 samples exhibit a two-dimensional cube-on-cube growth mode and a pseudo-cubic structure up to a thickness of 15 nm and of 25 nm when deposited on (001) SrTiO3 and (110) DyScO3, respectively. Above these thicknesses, we observe a switching to a three-dimensional island growth mode and a simultaneous structural change to a (00l) oriented monoclinic unit cell. While ferromagnetism is observed below a T-C approximate to 100K for all samples, signatures of room temperature ferroelectricity were found only in the pseudo-cubic ultra-thin films, indicating a correlation between electronic and structural orders

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Structural anomalies at the magnetic transition in centrosymmetricBiMnO3

Cited by 82 publications

References 12 publications

Orbital ordering and magnetic interactions in BiMnO₃

Orbital ordering and magnetic interactions in BiMnO₃

Magnetoelectricity in the ferrimagnetic Cu2OSeO3: symmetry analysis and Raman scattering study

Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films

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Structural anomalies at the magnetic transition in centrosymmetricBiMnO3

Cited by 82 publications

References 12 publications

Orbital ordering and magnetic interactions in BiMnO3

Orbital ordering and magnetic interactions in BiMnO3

Magnetoelectricity in the ferrimagnetic Cu2OSeO3: symmetry analysis and Raman scattering study

Ferromagnetism and ferroelectricity in epitaxial BiMnO3 ultra-thin films

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Product

Resources

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Orbital ordering and magnetic interactions in BiMnO₃

Orbital ordering and magnetic interactions in BiMnO₃