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Chiral crystal-structure transformation of R_3Co_4Sn_(13) (R = La and Ce)

机译：R_3Co_4Sn_（13）（R = La和Ce）的手性晶体结构转变

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摘要

The compounds designated as R_3T_4Sn_(13) (R = rare earth and T = transition metal) are hypothesized to be strongly correlated electron systems. Some of these compounds exhibit structural phase transitions with speculated charge-density-wave (CDW) formations. We carried out x-ray diffraction measurements in order to investigate the second-order phase transition of R_3Co_4Sn_(13) (R = La and Ce) by using single-crystalline samples synthesized by the molten Sn-flux method. Both compounds exhibit the structural superlattice transformations characterized by the wave vector q = (1/2, 1/2, 0) below T_D ≃ 160 K, which originate from electronic states owing to the common Co and Sn. The space group of the low-temperature phase is evidenced as a chiral cubic I2_13. The magnetic-susceptibility enhancement and the Co-ion valence shift below T_D are signatures of a phase transition not fully attributed to the conventional CDW formation.
机译：假设指定为R_3T_4Sn_（13）的化合物（R =稀土和T =过渡金属）是高度相关的电子系统。这些化合物中的一些表现出具有推测的电荷密度波（CDW）形成的结构相变。为了研究R_3Co_4Sn_（13）（R = La和Ce）的二阶相变，我们进行了X射线衍射测量，方法是使用通过熔融Sn-磁通量法合成的单晶样品。两种化合物均表现出结构超晶格转变，其特征是在T_D≤160 K以下时，波矢量q =（1/2，1/2，0），这是由于Co和Sn共同而产生的电子态。低温相的空间群被证明为手性立方I2_13。磁化率增强和低于T_D的Co离子化合价偏移是不完全归因于常规CDW形成的相变的标志。

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  • 来源
    《Physical review》 |2016年第7期|075109.1-075109.8|共8页
  • 作者

    Yuka Otomo; Kazuaki Iwasa; Kazuya Suyama; Keisuke Tomiyasu; Hajime Sagayama; Ryoko Sagayama; Hironori Nakao; Reiji Kumai; Youichi Murakami;

  • 作者单位

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan,Frontier Research Center for Applied Atomic Sciences, Ibaraki University, Tokai, Naka, Ibaraki 319-1106, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan;

    Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan;

    Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan;

    Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan;

    Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan;

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