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Incommensurate magnetic structures of multiferroic MnWO_4 studied within the superspace formalism

机译：在超空间形式主义中研究的多铁性MnWO_4的不对称磁性结构

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摘要

The magnetic structures of the incommensurate phases of the prototypic multiferroic MnWO_4 are analyzed using superspace symmetry formalism. This approach shows in a very simple way the relation between the magnetic symmetry of the incommensurate phases and any tensorial property, such as ferroelectricity. The magnetic structures have been redetermined by single-crystal neutron diffraction experiments, which revealed fine details of the AF3 and AF2 magnetic structures. The spin modulations of the two manganese ions of the basic unit cell are symmetry-related in the paraelectric incommensurate-magnetic structure (AF3)-they are not forced to be collinear but they must have opposite chirality-while in the multiferroic phase (AF2) they become symmetry independent. It is due to this symmetry break that the electric polarization arises along the b axis.
机译：使用超空间对称形式主义分析了原型多铁性MnWO_4不相称相的磁性结构。这种方法以非常简单的方式显示了不相称相的磁对称性与任何张量特性（例如铁电）之间的关系。磁结构已通过单晶中子衍射实验重新确定，该实验揭示了AF3和AF2磁结构的精细细节。基本单位晶胞中两个锰离子的自旋调制在顺电不相称磁性结构（AF3）中与对称相关-它们没有被迫共线，但必须具有相反的手性-而在多铁相（AF2）中它们变得独立于对称。由于这种对称破坏，沿b轴产生了极化。

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  • 来源
    《Physical review》 |2013年第1期|014419.1-014419.10|共10页
  • 作者

    I. Urcelay-Olabarria; J. M. Perez-Mato; J. L. Ribeiro; J. L. Garcia-Munoz; E. Ressouche; V. Skumryev; A. A. Mukhin;

  • 作者单位

    Institut Laue Langevin, 6 rue Jules Horowitz BP 156, F-38042 Grenoble Cedex 9, France;

    Departamento de Fisica de la Materia Condensada, Facultad de Ciencia y Tecnologia, Universidad del Pat's Vasco, UPV-EHU, Spain;

    Centro de Fisica da Universidade do Minho, 4710-057 Braga, Portugal;

    Institut de Ciencia de Materials de Barcelona, ICMAB-CSIC, Campus universitari de Bellaterra, E-08193 Bellaterra, Spain;

    SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble F-38054, France;

    Institucio Catalana de Recerca i Estudis Avancats, E-08010 Barcelona, Spain and Departament de Fisica, Universitat Autbnoma de Barcelona, E-08193 Bellaterra, Spain;

    Prokhorov General Physics Institute, Russian Academy of Science, Vavilov Street 38, 119991 Moscow, Russian Federation;

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  • 关键词

    antiferromagnetics;

    机译：反铁磁;

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