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首页> 外文期刊>Physical review >Ferrimagnetism, antiferromagnetism, and magnetic frustration in La_(2-x)Sr_xCuRuO_6 (0 ≤x ≤ 1)
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Ferrimagnetism, antiferromagnetism, and magnetic frustration in La_(2-x)Sr_xCuRuO_6 (0 ≤x ≤ 1)

机译:La_(2-x)Sr_xCuRuO_6(0≤x≤1)中的亚铁磁性,反铁磁性和磁阻

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摘要

We studied structural and magnetic properties of a series of insulating double perovskite compounds, La_(2-x)Sr_xCuRuO_6 (0 ≤ x ≤ 1), representing doping via A-site substitution. The end members La_2CuRuO_6 and LaSrCuRuO_6 form in monoclinic structure while the intermediate Sr doped compounds stabilize in triclinic structure. The Cu and Ru ions sit on alternate B sites of the perovskite lattice with ~15% antisite defects in the undoped sample while the Sr-doped samples show a tendency to higher ordering at B sites. The undoped (x = 0) compound shows a ferrimagnetic-like behavior at low temperatures. In surprising contrast to the usual expectation of an enhancement of ferromagnetic interaction on doping, an antiferromagnetic-like ground state is realized for all doped samples (x > 0). Heat capacity measurements indicate the absence of any long-range magnetic order in any of these compounds. The magnetic relaxation and memory effects observed in all compounds suggest glassy dynamical properties associated with magnetic disorder and frustration. We show that the observed magnetic properties are dominated by the competition between the nearest-neighbor Ru-O-Cu 180° superexchange interaction and the next-nearest-neighbor Ru-O-O-Ru 90° superexchange interaction as well as by the formation of antisite defects with interchanged Cu and Ru positions. Our calculated exchange interaction parameters from first principles calculations for x = 0 and x = 1 support this interpretation.
机译:我们研究了一系列绝缘的双重钙钛矿化合物La_(2-x)Sr_xCuRuO_6(0≤x≤1)的结构和磁性,这些化合物代表通过A位取代进行掺杂。端部成员La_2CuRuO_6和LaSrCuRuO_6以单斜晶结构形成,而掺杂Sr的中间化合物稳定在三斜晶结构中。 Cu和Ru离子位于钙钛矿晶格的交替B位上,在未掺杂样品中具有〜15%的反位缺陷,而Sr掺杂样品显示出在B位上有更高次序的趋势。未掺杂的(x = 0)化合物在低温下表现出类似铁磁的行为。与通常预期的在掺杂时增强铁磁相互作用的相反,对于所有掺杂样品都实现了类似反铁磁的基态(x> 0)。热容测量表明,这些化合物中的任何一种都不存在任何长距离磁序。在所有化合物中观察到的磁弛豫和记忆效应表明与磁异常和沮丧相关的玻璃态动力学性质。我们表明观察到的磁性能主要由最近邻的Ru-O-Cu 180°超交换相互作用与次近邻的Ru-OO-Ru 90°超交换相互作用之间的竞争以及反位的形成决定铜和钌位置互换的缺陷。我们根据x = 0和x = 1的第一性原理计算得出的交换相互作用参数支持这种解释。

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  • 来源
    《Physical review》 |2012年第9期|p.094421.1-094421.10|共10页
  • 作者单位

    Centre for Advanced Materials, Indian Association for the Cultivation of Science, Kolkata 700032, India,Department of Engineering Sciences, Uppsala University, P.O. Box 534, SE-751 21 Uppsala, Sweden;

    Department of Engineering Sciences, Uppsala University, P.O. Box 534, SE-751 21 Uppsala, Sweden;

    Materials Division, School of Advanced Sciences, VIT University, Vellore 632 014, Tamil Nadu, India;

    Department of Solid State Physics, Indian Association for the Cultivation of Science, Kolkata 700032, India;

    Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden;

    Materials Division, School of Advanced Sciences, VIT University, Vellore 632 014, Tamil Nadu, India;

    Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden;

    Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden;

    Centre for Advanced Materials, Indian Association for the Cultivation of Science, Kolkata 700032, India,Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden,Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India;

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  • 关键词

    exchange and superexchange interactions; dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.); effects of crystal defects, doping and substitution;

    机译:交换和超级交换互动;动态特性(动态磁化率;自旋波;自旋扩散;动态缩放等);晶体缺陷;掺杂和取代的影响;

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