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首页> 外文期刊>Physical review >Field-induced polar order at the Neel temperature of chromium in rare-earth orthochromites: Interplay of rare-earth and Cr magnetism
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Field-induced polar order at the Neel temperature of chromium in rare-earth orthochromites: Interplay of rare-earth and Cr magnetism

机译：稀土正铬铁矿中铬在Neel温度下的场致极性序：稀土和Cr磁性的相互作用

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摘要

We report field-induced switchable polarization (P ～ 0.2-0.8 μC/cm~2) below the Neel temperature of chromium (T_N~(Cr)) in weakly ferromagnetic rare-earth orthochromites, RCrO_3 (R = rare earth) but only when the rare-earth ion is magnetic. Intriguingly, the polarization in ErCrO_3 (T_c = 133 K) disappears at a spin-reorientation (Morin) transition (T_(sr) ～22 K) below which the weak ferromagnetism associated with the Cr sublattice also disappears, demonstrating the crucial role of weak ferromagnetism in inducing the polar order. Further, the polarization (P) is strongly influenced by an applied magnetic field, indicating a strong magnetoelectric effect. We suggest that the polar order occurs in RCrO_3, due to the combined effect of the poling field that breaks the symmetry and the exchange field on the R ion from the Cr sublattice that stabilizes the polar state. We propose that a similar mechanism could work in the isostructural rare-earth orthoferrites RFeO_3 as well.
机译：我们报告了在弱铁磁性稀土原铬铁矿RCrO_3（R =稀土）中，在铬的Neel温度（T_N〜（Cr））以下，场致可转换极化（P〜0.2-0.8μC/ cm〜2）低于铬的Neel温度（T_N〜（Cr）），但仅当稀土离子是磁性的。有趣的是，ErCrO_3（T_c = 133 K）中的极化在自旋取向（Morin）转变（T_（sr）〜22 K）时消失，在该转变以下，与Cr次晶格有关的弱铁磁性也消失了，表明了弱Cr的重要作用。铁磁在诱导极性有序时。此外，极化（P）受到施加的磁场的强烈影响，表明强的磁电效应。我们建议极性顺序出现在RCrO_3中，这是由于极化场破坏了对称性，而交换场对来自Cr子晶格的Cr亚晶格稳定R离子的交换场的综合作用。我们提出类似的机制也可以在同构稀土正铁氧体RFeO_3中起作用。

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  • 来源
    《Physical review》 |2012年第21期|214409.1-214409.5|共5页
  • 作者

    B. Rajeswaran; D. I. Khomskii; A. K. Zvezdin; C. N. R. Rao; A. Sundaresan;

  • 作者单位

    Chemistry and Physics of Materials Unit and International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064, India;

    Ⅱ. Physikalisches Institut, Universitaet zu Koln, ZulpicherStrasse 77, 50937 Koln, Germany;

    A. M. Prokhorov General Physics Insitute of the Russian Academy of Science - Vavilova 38, Moscow, 119991, Russia,Moscow Institute of Physics and Technology (State University) - Institutskii per. 9, Dolgoprudny, 141700, Russia;

    Chemistry and Physics of Materials Unit and International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064, India;

    Chemistry and Physics of Materials Unit and International Centre for Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064, India;

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  • 正文语种 eng
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  • 关键词

    manganites; ferroelectricity and antiferroelectricity;

    机译：锰矿;铁电和反铁电;

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