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NEUTRON DIFFRACTION STUDIES OF TWO-DIMENSIONAL HIGH-ORDER MAGNETIC MODULATION IN RRru_2Si_2 (R: Tb, Dy)

RRru_2Si_2 (R: Tb, Dy)二维高阶磁调制的中子衍射研究

基本信息

批准号：
13640362
负责人：
KAWANO Shinji
金额：
$ 2.05万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

(1)DyRu_2Si_2From pulsed-neutron diffraction measurements of single crystal DyRu_2Si_2, we have confirmed that at the high temperature phase the magnetic modulation is one-dimensional with Q=(2/9 0 0). On the other hand, at the intermediate temperature phase many magnetic satellites on low-symmetry lines as well as high-symmetry lines have been observed in the a^*-b^* reciprocal plane. This is the evidence for the modulation being not one-dimensional but two-dimensional. The distribution of the magnetic satellites is reproduced by a magnetic unit cell of 9a×9a×c, in which the corner and the body-centered Dy ions are effectively paramagnetic due to frustration. Furthermore, pulsed-neutron experiments under magnetic fields at the ISIS, we have made clear the magnetic modulation of the four metamagnetic phases at low temperatures .(1) TbRu_2Si_2From single crystal neutron diffraction studies of TbRu_2Si_2 at Risoe National Laboratory, Denmark we have confirmed that the magnetic modulation is one-dimensional with Q=(3/13 0 0), but established the modulation for the intermediate temperature phase (ITP) to be two-dimensional of the magnetic unit cell being 13a×13a×c, including two frustrated Tb ions at the corner and body-centered positions, similar to the modulation of DyRu_2Si_2. Furthermore, for the low temperature phase two domains of a domain with Q=(3/13 1/4 0) and the ITP domain slightly distorted monoclinically in the a-b plane coexist.

(1)DyRu_2Si_2单晶的脉冲中子衍射法测量证实，在高温阶段，磁调制是一维的，Q=(2/9 0 0)。另一方面，在中温阶段，在a^*-b^*互易面上观测到了许多低对称线和高对称线上的磁卫星。这是调制不是一维的，而是二维的证据。磁性卫星的分布由一个9a×9a×c的磁性单胞再现，其中的角区和体心Dy离子由于受挫而有效地是顺磁性的。此外，在ISIS的磁场下的脉冲中子实验，我们已经弄清楚了低温下四个变磁相的磁调制：(1)TbRu_2Si_2从丹麦RISOE国家实验室的TbRu_2Si_2单晶中子衍射研究中，我们证实了TbRu_2Si_2的磁调制是一维的，Q=(3/13 0)，但确定了中温相(ITP)的调制是磁单位晶胞的二维13a×13a×c，包括两个位于角落和体心位置的受挫Tb离子，类似于DyRu_2Si_2的调制。对于低温相，Q=(3/13 1/4 0)的两个磁区与ITP磁区在a-b平面上单斜轻微变形共存。