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首页> 外文期刊>Physical review >Successive antiferromagnetic transitions with multi-k and noncoplanar spin order, spin fluctuations, and field-induced phases in deformed pyrochlore compound Co_2(OH)_3Br
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Successive antiferromagnetic transitions with multi-k and noncoplanar spin order, spin fluctuations, and field-induced phases in deformed pyrochlore compound Co_2(OH)_3Br

机译：在变形烧绿石化合物Co_2（OH）_3Br中具有多个k和非共面自旋顺序，自旋涨落和场感应相的连续反铁磁跃迁

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摘要

Structure and magnetic properties of the rhombohedral-structure compound Co_2(OH)_3Br, a member of the geometrically frustrated series of the compounds M_2(OH)_3X where the magnetic ions form a deformed pyrochlore lattice, were studied using dc and ac magnetic susceptibilities, heat-capacity, neutron powder-diffraction, and muon-spin-rotation/-relaxation (μSR) measurements. The structure of Co_2(OH)_3Br is featured by alternatively stacked layers of perfect kagome-lattice planes and triangular-lattice planes with a 10% distortion along the stacking direction (the c axis). Despite a very small difference in the distortion [0.42% larger in Co_2(OH)_3Br], Co_2(OH)_3Br was found to show contrasting antiferromagnetism that is strikingly different from the previously reported ferromagnetic Co_2(OH)_3Cl. Successive antiferromagnetic transition was observed at TN1=6.2 K and TN2=4.8 K, respectively. The antiferromagnetic ground state is metastable and an intermediate magnetic phase was induced by applying a relatively low magnetic field of H~ 5 kOe. When the field was further increased above H~20 kOe spin reorientation occurred to form a configuration similar to ferromagnetic Co_2(OH)_3Cl. The successive antiferromagnetic transitions in zero field were found to occur with propagation vector of k1 = (0 -1/2 1/2) at TN1 and an additional k_2=(0 0 3/2) at T_(N2). Refinement of the neutron powder-diffraction patterns revealed an unconventional multi-K and noncoplanar spin structure for the antiferromagnetic phases. Multiple measurements, in particular, the μSR study, consistently demonstrated magnetic coupling at high temperatures, and persistent fluctuations well below the T_N. This work presents a unique system to investigate the orbital effect and the critical role of lattice distortion in geometric frustration, and provides a single material system to study multiple phase transitions and competing exchange interactions.
机译：利用直流和交流磁化率研究了菱形结构化合物Co_2（OH）_3Br的结构和磁性，该结构是化合物M_2（OH）_3X的几何受挫序列系列的成员，其中磁性离子形成了变形的烧绿石晶格，热容量，中子粉末衍射和μ自旋旋转/弛豫（μSR）测量。 Co_2（OH）_3Br的结构的特征是，理想的kagome晶格平面和三角形晶格平面的交替堆叠层沿堆叠方向（c轴）有10％的变形。尽管畸变差异很小（在Co_2（OH）_3Br中增大0.42％），但发现Co_2（OH）_3Br显示出相反的反铁磁性，与先前报道的铁磁Co_2（OH）_3Cl明显不同。分别在TN1 = 6.2 K和TN2 = 4.8 K处观察到连续的反铁磁跃迁。反铁磁基态是亚稳态的，并且通过施加相对较低的H〜5 kOe磁场感应出中间磁相。当磁场进一步增加到H〜20 kOe以上时，发生自旋重取向，形成类似于铁磁Co_2（OH）_3Cl的构型。发现在零场处出现连续的反铁磁跃迁，其中在TN1处的传播矢量为k1 =（0 -1/2 1/2），在T_（N2）处的附加k_2 =（0 0 3/2）。中子粉末衍射图的细化显示反铁磁相具有非常规的多K和非共面自旋结构。多次测量，特别是μSR研究，始终证明了高温下的磁耦合以及远低于T_N的持续波动。这项工作提供了一个独特的系统来研究轨道效应以及晶格畸变在几何挫折中的关键作用，并提供了一个单一的材料系统来研究多个相变和竞争性交换相互作用。

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  • 来源
    《Physical review》 |2010年第21期|p.214424.1-214424.12|共12页
  • 作者

    Masato Hagihala; Xu-Guang Zheng; Tatsuya Kawae; Taku J. Sato;

  • 作者单位

    Department of Physics, Graduate School of Science and Engineering, Saga University, Saga 840-8502, Japan;

    Department of Physics, Graduate School of Science and Engineering, Saga University, Saga 840-8502, Japan,Department of Physics, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan;

    Department of Applied Quantum Physics, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan;

    Institute for Solid State Physics, The University of Tokyo, Chiba 277-8581, Japan;

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  • 关键词

    intrinsic properties of magnetically ordered materials; antiferromagnetics; muon spin rotation and relaxation;

    机译：磁性有序材料的固有性质;反磁性;μ子自旋旋转和弛豫;

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