Canted magnetic structure arising from rare-earth mixing in the Laves-phase compound (Nd0.5Tb0.5)Co-2

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	Canted magnetic structure arising from rare-earth mixing in the Laves-phase compound (Nd0.5Tb0.5)Co-2
	Y. G. Xiao; Q. Huang; Z. W. Ouyang; F. W. Wang; J. W. Lynn; J. K. Liang; G. H. Rao
	2006
发表期刊	Physical Review B
ISSN	1098-0121
卷号	73 期号:6
摘要	The crystal and magnetic structures of Laves-phase compound (Nd0.5Tb0.5)Co-2 have been investigated by high resolution neutron powder diffraction at different temperatures. Magnetization measurement and neutron diffraction reveal two magnetic transitions at T-C approximate to 173 K and T-M approximate to 47 K, respectively. At room temperature, the compound crystallizes in the MgCu2-type (C15) structure. Below T-C, rhombohedral distortion and large anisotropic magnetostriction take place and persist down to 4 K. In contrast to the binary rare earth (R)-Co Laves-phases RCo2, a noncollinear magnetic structure (canted) is deduced for (Nd0.5Tb0.5)Co-2, based on the Rietveld refinement of the neutron diffraction data at 50 K and 4 K. In addition, the correlation between lattice distortion and easy magnetization direction (EMD) commonly observed for binary RCo2 is violated in (Nd0.5Tb0.5)Co-2. Though the crystal structure remains rhombohedral, the EMD of the R sublattice is close to the [110] direction at 50 K of the pseudocubic lattice and along the [111] direction at 4 K, respectively. The difference of the canting angle between the magnetic structures at 50 K and 4 K is small, indicating stable canted configurations. The lattice parameters exhibit a discontinuity around T-M, suggesting a first-order transition between the two canted magnetic structures. The dilution of magnetic anisotropy of the R sublattice and the contribution of the magnetic anisotropy of the Co sublattice are responsible for the observations.
部门归属	chinese acad sci, inst phys, beijing natl lab condensed matter phys, beijing 100080, peoples r china. natl inst stand & technol, ctr neutron res, gaithersburg, md 20899 usa. acad sinica, int ctr mat phys, shenyang 110015, peoples r china.;xiao, yg (reprint author), chinese acad sci, inst phys, beijing natl lab condensed matter phys, pob 603, beijing 100080, peoples r china, peoples r china;ghrao@aphy.iphy.ac.cn
关键词	Neutron Powder-diffraction Rco2 Transition Heavy Light
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WOS记录号	WOS:000235668600056
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34602
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. G. Xiao,Q. Huang,Z. W. Ouyang,et al. Canted magnetic structure arising from rare-earth mixing in the Laves-phase compound (Nd0.5Tb0.5)Co-2[J]. Physical Review B,2006,73(6).
APA	Y. G. Xiao.,Q. Huang.,Z. W. Ouyang.,F. W. Wang.,J. W. Lynn.,...&G. H. Rao.(2006).Canted magnetic structure arising from rare-earth mixing in the Laves-phase compound (Nd0.5Tb0.5)Co-2.Physical Review B,73(6).
MLA	Y. G. Xiao,et al."Canted magnetic structure arising from rare-earth mixing in the Laves-phase compound (Nd0.5Tb0.5)Co-2".Physical Review B 73.6(2006).