Magnetic structure, magnetostriction, and magnetic transitions of the Laves-phase compound NdCO2

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	Magnetic structure, magnetostriction, and magnetic transitions of the Laves-phase compound NdCO2
	Z. W. Ouyang; F. W. Wang; Q. Huang; W. F. Liu; Y. G. Xiao; J. W. Lynn; J. K. Liang; G. H. Rao
	2005
发表期刊	Physical Review B
ISSN	1098-0121
卷号	71 期号:6
摘要	The crystal and the magnetic structures as well as magnetostriction of the Laves-phase compound NdCo2 are investigated by means of temperature-dependent high-resolution neutron-powder diffraction. The compound crystallizes in the cubic Laves phase C15 structure at high temperature, undergoes a tetragonal distortion (space group I4l/amd) around T(C)approximate to 100 K and an orthorhombic distortion (space group Fddd) at T 42 K. The temperature dependence of lattice constants, magnetostriction constant, and magnetic moment indicate that the magnetic and structural transitions are second order in the vicinity of T-C and are first-order around 42 K. Refinements of magnetic structure reveal that the Nd moment distinctly exhibits an abrupt increase at the first-order transition and the easy magnetization direction of the compound changes from [001] in the tetragonal lattice to [011] in the orthorhombic lattice, indicating a strong coupling between crystal structure and magnetic properties at zero field. Analysis of the temperature dependence of bondlength suggests a strong magnetic exchange striction in the tetragonal structure and that the abrupt increase of the Nd moment is attributed essentially to a change in crystal electric field. Field-dependent neutron diffraction reveals a decoupling of the magnetic and structural transitions under relatively modest magnetic fields.
部门归属	chinese acad sci, inst phys, beijing natl lab condensed matter phys, beijing 100080, peoples r china. natl inst stand & technol, nist ctr neutron res, gaithersburg, md 20899 usa. acad sinica, int ctr mat phys, shenyang 110016, peoples r china.;ouyang, zw (reprint author), chinese acad sci, inst phys, beijing natl lab condensed matter phys, pob 603, beijing 100080, peoples r china;ghrao@aphy.iphy.ac.cn
关键词	Itinerant-electron Metamagnetism Neutron Powder-diffraction Intermetallic Compounds Exchange Heavy Light Hoco2 Order
URL	查看原文
WOS记录号	WOS:000228013500039
引用统计	被引频次：42[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/321006/34991
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. W. Ouyang,F. W. Wang,Q. Huang,et al. Magnetic structure, magnetostriction, and magnetic transitions of the Laves-phase compound NdCO2[J]. Physical Review B,2005,71(6).
APA	Z. W. Ouyang.,F. W. Wang.,Q. Huang.,W. F. Liu.,Y. G. Xiao.,...&G. H. Rao.(2005).Magnetic structure, magnetostriction, and magnetic transitions of the Laves-phase compound NdCO2.Physical Review B,71(6).
MLA	Z. W. Ouyang,et al."Magnetic structure, magnetostriction, and magnetic transitions of the Laves-phase compound NdCO2".Physical Review B 71.6(2005).