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首页> 外文期刊>Physical review >Switching from pyroelectric to ferroelectric order in Ni-doped CaBaCo_4O_7
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Switching from pyroelectric to ferroelectric order in Ni-doped CaBaCo_4O_7

机译：掺Ni的CaBaCo_4O_7中从热电有序转换为铁电有序

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摘要

We report ferroelectric ordering in Ni-substituted CaBaCo_4O_7. Magnetization showed ferrimagnetic transition at 60 K and an additional magnetic anomaly is found at ~82 K. The enhanced antiferromagnetic interactions and decrease in saturation magnetization are noticed with Ni substitution. The dielectric and pyroelectric measurements illustrate strong coupling between spin and charge degrees of freedom. Ferroelectric behavior is confirmed with enhanced ordering temperature (~82K) and saturation polarization (250μC/m~2). Neutron diffraction has revealed an increase in c-lattice parameter in the Ni sample. All the Co/Ni moments are reoriented in the a direction. A transition from a noncollinear ferrimagnetic to a collinear ferrimagnetic spin order, with ↑↑↓↓ antiferromagnetic ordering in the kagome layer, is observed with substitution. This results in the appearance of unequal bond distances in a two-dimensional collinear layer; most likely this is responsible for the transition from pyroelectric to ferroelectric, with the possibility of switching of electric polarization.
机译：我们报告了镍取代的CaBaCo_4O_7中的铁电有序。磁化强度在60 K时显示出亚铁磁跃迁，在〜82 K处发现了另一个磁异常。Ni取代引起反铁磁相互作用增强和饱和磁化强度降低。介电和热电测量表明自旋和电荷自由度之间的强耦合。增强的有序温度（〜82K）和饱和极化（250μC/ m〜2）证实了铁电行为。中子衍射显示出镍样品中c晶格参数的增加。所有的Co / Ni力矩都沿a方向重新定向。替换后，在kagome层中观察到了从非共线亚铁磁自旋向共线亚铁磁自旋的跃迁，其中↑↑↓↓反铁磁有序。这导致在二维共线层中出现不相等的键距；这很可能是造成从热电到铁电的转变，并可能发生极化转换。

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  • 来源
    《Physical review》 |2017年第13期|134413.1-134413.6|共6页
  • 作者

    C. Dhanasekhar; A. K. Das; ipandeep Singh; A. Das; G. Giovannetti; D. Khomskii; A. Venimadhav;

  • 作者单位

    Department of Physics, Indian Institute of Technology, Kharagpur-721302, India,Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur-721302, India;

    Department of Physics, Indian Institute of Technology, Kharagpur-721302, India;

    Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;

    Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;

    Consiglio Nazionale delle Ricerche-Istituto Nazionale per la Fisica della Materia (CNR-INFM), CASTI Regional Laboratory, 67100 L'Aquila, Italy;

    Physikalisches Institut, Universitaetzu Koeln, ZuelpicherStrasse 77, 50937 Koen, Germany;

    Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur-721302, India;

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