Structural anomalies at the magnetic transition in centrosymmetric BiMnO3

被引：68

作者：

Montanari, E.

Calestani, G.

Righi, L.

Gilioli, E.

Bolzoni, F.

Knight, K. S.

Radaelli, P. G.

机构：

[1] Univ Parma, GIAF, Dipartimento Chim, I-43100 Parma, Italy

[2] CNR, IMEM, I-43010 Parma, Italy

[3] Rutherford Appleton Lab, ISIS Facil, CCLRC, Didcot OX11 0QX, Oxon, England

[4] UCL, Dept Phys & Astron, London WC1E 6BT, England

来源：

PHYSICAL REVIEW B | 2007年 / 75卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.75.220101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structural properties of BiMnO3 were determined from neutron powder diffraction data as a function of temperature and magnetic field. The structure at all temperatures was found to be centrosymmetric with space group C2/c, which is incompatible with ferroelectricity. At T-C similar or equal to 100 K, we observed the onset of a large magnetoelastic strain, proportional to the square of the magnetization. We interpret this structural rearrangement, together with the previously observed magnetodielectric anomalies, due to the need to optimize the partially frustrated magnetic interactions.

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