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Stabilized helical spin order and multiferroic phase coexistence in MnWO_4: Consequence of 4d Ru substitution of Mn

机译:MnWO_4中稳定的螺旋自旋顺序和多铁相共存:Mn的4d Ru置换的结果

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摘要

Most earlier work on the effect of chemical substitution in multiferroic MnWO_4 has focused on the 3d transition metal substitution of Mn. In this paper, we investigate the Ru substitution of Mn in polycrystalline Mn_(1-x)Ru_(x/2)WO_4 in order to unveil the consequence of Ad transition metal substitution in terms of magnetic transitions and ferroelectricity. It is found that the Ru substitution substantially reshuffles the magnetic frustration and stabilizes the incommensurate helical spin-order phase (AF2) by partially suppressing the collinear spin-order phase (AF1 phase). The coexistence of the AF2 and AF1 phases at low temperature is suggested. Consequently, the ferroelectric polarization is remarkably enhanced, accompanied with significant response of the polarization to magnetic field. It is argued that the structural distortion and enhanced spin-orbital coupling associated with the Ru substitution may be responsible for this ferroelectricity enhancement.
机译:关于多铁性MnWO_4中化学取代作用的最新研究集中在Mn的3d过渡金属取代上。在本文中,我们研究了多晶Mn_(​​1-x)Ru_(x / 2)WO_4中Mn的Ru取代,以揭示Ad过渡金属取代在磁跃迁和铁电方面的后果。发现Ru取代通过部分地抑制共线自旋相(AF1相)而实质上改组了磁挫并且稳定了不相称的螺旋自旋相(AF2)。建议在低温下AF2和AF1相共存。因此,铁电极化显着增强,伴随着极化对磁场的显着响应。有人认为,与Ru取代相关的结构变形和自旋轨道耦合增强可能是铁电增强的原因。

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  • 来源
    《Physical review》 |2013年第10期|104404.1-104404.8|共8页
  • 作者单位

    Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;

    Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;

    Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;

    Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;

    Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;

    Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;

    Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China,Institute for Advanced Materials, South China Normal University, Guangzhou 510006, China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic phase boundaries (including magnetic transitions; metamagnetism; etc.); ferroelectricity and antiferroelectricity;

    机译:磁相边界(包括磁跃迁;超磁性等);铁电和反铁电;

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