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Magnetic structure, magnetostriction, and magnetic transitions of the Laves-phase compound NdCO2
Ouyang, ZW; Wang, FW; Huang, Q; Liu, WF; Xiao, YG; Lynn, JW; Liang, JK; Rao, GH
Corresponding AuthorOuyang, ZW()
2005-02-01
Source PublicationPHYSICAL REVIEW B
ISSN1098-0121
Volume71Issue:6Pages:8
AbstractThe 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.
DOI10.1103/PhysRevB.71.064405
Indexed BySCI
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Condensed Matter
WOS IDWOS:000228013500039
PublisherAMERICAN PHYSICAL SOC
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82105
Corresponding AuthorOuyang, ZW
Affiliation1.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China
2.Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
3.Acad Sinica, Int Ctr Mat Phys, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Ouyang, ZW,Wang, FW,Huang, Q,et al. Magnetic structure, magnetostriction, and magnetic transitions of the Laves-phase compound NdCO2[J]. PHYSICAL REVIEW B,2005,71(6):8.
APA Ouyang, ZW.,Wang, FW.,Huang, Q.,Liu, WF.,Xiao, YG.,...&Rao, GH.(2005).Magnetic structure, magnetostriction, and magnetic transitions of the Laves-phase compound NdCO2.PHYSICAL REVIEW B,71(6),8.
MLA Ouyang, ZW,et al."Magnetic structure, magnetostriction, and magnetic transitions of the Laves-phase compound NdCO2".PHYSICAL REVIEW B 71.6(2005):8.
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