Crystal and magnetic structures of RCuSb2 (R = Dy, Ho) compounds
Crystal and magnetic structures of RCuSb2 (R = Dy, Ho) compounds
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DOI：
10.1016/j.jallcom.2004.04.065
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发表时间：
2004-11
影响因子：
6.2
通讯作者：
A. Szytuła;M. Kolenda;A. Oleś
中科院分区：
文献类型：
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作者：
A. Szytuła;M. Kolenda;A. Oleś
在低温下对RCuSb2(R=Dy和Ho)化合物进行了粉末中子衍射测量。这些化合物为四方相的ZrCuSi2型结构，为反铁磁体，Néel温度分别为6.4K(R=Dy)和4.5K(R=Ho)。在1.5K时，DyCuSb2的磁序可以用传播矢量k=(0，0.119，0.521)来描述。在相同温度下，HoCuSb2的磁序由三个传播矢量来描述：K1=(0，0.465，0.260)，K2=(0，0.408，0.770)和K3=(0，0，0.519)。随着温度的升高，k1所描述的结构在3.5K左右消失，而k2和k3所描述的另外两种结构在Néel温度下是稳定的。Dy和Ho磁矩在基面上形成正弦波调制结构。
Powder neutron diffraction measurements have been carried out on RCuSb2(R = Dy and Ho) compounds at low temperatures. These compounds crystallize in a tetragonal ZrCuSi2-type structure and are antiferromagnets with the Néel temperatures equal to 6.4K (R = Dy) and 4.5K (R = Ho). At 1.5K the magnetic order of DyCuSb2can be described by the propagation vector k = (0, 0.119, 0.521). At the same temperature the magnetic order in HoCuSb2is described by three propagation vectors: k1= (0, 0.465, 0.260), k2= (0, 0.408, 0.770) and k3= (0, 0, 0.519). With increasing temperature the structure described by k1disappears about 3.5K while the two other structures described by k2and k3are stable up to the Néel temperature. The Dy and Ho magnetic moments form a sine-wave modulated structure in the basal plane.