Cu3Nb2O8: A Multiferroic with Chiral Coupling to the Crystal Structure

被引：80

作者：

Johnson, R. D. ^{[1
,2
]}

Nair, Sunil ^{[1
]}

Chapon, L. C. ^{[2
]}

Bombardi, A. ^{[3
]}

Vecchini, C. ^{[3
]}

Prabhakaran, D. ^{[1
]}

Boothroyd, A. T. ^{[1
]}

Radaelli, P. G. ^{[1
]}

机构：

[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[2] Rutherford Appleton Lab STFC, ISIS Facil, Didcot OX11 0QX, Oxon, England

[3] Diamond Light Source, Didcot OX11 0DE, Oxon, England

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 13期

基金：

英国工程与自然科学研究理事会;

关键词：

FERROELECTRIC POLARIZATION;

D O I：

10.1103/PhysRevLett.107.137205

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By combining bulk properties, neutron diffraction, and nonresonant x-ray diffraction measurements, we demonstrate that the new multiferroic Cu3Nb2O8 becomes polar simultaneously with the appearance of generalized helicoidal magnetic ordering. The electrical polarization is oriented perpendicularly to the common plane of rotation of the spins-an observation that cannot be reconciled with the conventional theory developed for cycloidal multiferroics. Our results are consistent with coupling between a macroscopic structural rotation, which is allowed in the paramagnetic group, and magnetically induced structural chirality.

引用

页数：5

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