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Properties of RRe_2Al_(10) (R=Y, Gd-Lu) crystals

机译:RRe_2Al_(10)(R = Y,Gd-Lu)晶体的性质

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摘要

Large single crystals of rare-earth rhenium aluminide RRe_2Al_(10)), with R=Y, and Gd-Lu were grown out of an Al-rich solution. Single crystal x-ray diffraction data confirmed the orthorhombic Cmcm structure for all members: R=Gd-Dy with TbRe_2Al_(10)-structure type (formula unit per cell Z=8); R=Y, and Ho-Lu with LuRe_2Al_(10)-structure type (Z=12). There is no evidence of a localized 3d electron moment in R=Y and Lu; R=Yb is nonmagnetic down to 1.8 K, but develops an enhanced electronic specific heat of ~95 mJ mol~(-1) K~(-2). Ordering temperatures range from ferromagnetic order in R=Gd with T_c=7.2(1) K, antiferromagnetic order in R=Tb at T_N=5.0(3) K, to R=Dy, Ho, and Er giving magnetic ordering temperatures of T_(mag) = 1.7(1), ≤ 0.4, and 1.1(2) K, respectively. All compounds have effective moments close in value to that of free R~(3+) at high temperatures.
机译:从富含Al的溶液中生长出具有R = Y的稀土铝化ide大单晶(RRe_2Al_(10))和Gd-Lu。单晶X射线衍射数据证实了所有成员的正交晶体Cmcm结构:R = Gd-Dy,具有TbRe_2Al_(10)-结构类型(每个单元的公式单位Z = 8); R = Y,并且具有LuRe_2Al_(10)-结构类型(Z = 12)的Ho-Lu。没有证据表明在R = Y和Lu中存在局部3d电子矩。 R = Yb在低至1.8 K时是非磁性的,但产生的电子比热提高了〜95 mJ mol〜(-1)K〜(-2)。有序温度范围从T = c(7.2(1)K的R = Gd中的铁磁有序,T_N = 5.0(3)K的R = Tb中的反铁磁有序到R = Dy,Ho和Er给出的磁有序温度T_( mag)= 1.7(1),≤0.4和1.1(2)K。所有化合物在高温下的有效力矩值均接近于游离R〜(3+)的力矩。

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  • 来源
    《Physical review》 |2009年第17期|174429.1-174429.11|共11页
  • 作者单位

    Department of Physics and Astronomy, Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA;

    Department of Physics and Astronomy, Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA;

    Department of Physics and Astronomy, Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    studies of specific magnetic materials;

    机译:特殊磁性材料的研究;

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