Magnetic ordering in EuRh2As2 studied by x-ray resonant magnetic scattering

被引：17
作者：
Nandi, S. [1 ,3 ]
Kreyssig, A. [1 ,3 ]
Lee, Y. [1 ,3 ]
Singh, Yogesh [1 ,3 ]
Kim, J. W. [2 ]
Johnston, D. C. [1 ,3 ]
Harmon, B. N. [1 ,3 ]
Goldman, A. I. [1 ,3 ]
机构：
[1] Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA
[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
[3] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
来源：
PHYSICAL REVIEW B | 2009年 / 79卷 / 10期
关键词：
antiferromagnetic materials; arsenic alloys; europium alloys; magnetic moments; magnetic structure; rhodium alloys; EXCHANGE SCATTERING; EU; EUPD2SI2; EUCU2SI2; ENERGY;
D O I：
10.1103/PhysRevB.79.100407
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Element-specific x-ray resonant magnetic scattering investigations were performed to determine the magnetic structure of Eu in EuRh2As2. In the temperature range from 46 K down to the lowest achievable temperature of 6 K, an incommensurate antiferromagnetic (ICM) structure with a temperature-dependent propagation vector tau approximate to(0 0 0.9) coexists with a commensurate antiferromagnetic (CM) structure. Angular-dependent measurements of the magnetic intensity indicate that the magnetic moments lie in the tetragonal basal plane and are ferromagnetically aligned within the a-b plane for both magnetic structures. The ICM structure is most likely a spiral-like magnetic structure with a turn angle of similar to 162 degrees (0.9 pi) between adjacent Eu planes in the c direction. In the CM structure, this angle is 180 degrees. These results are consistent with band-structure calculations which indicate a strong sensitivity of the magnetic configuration on the Eu valence.
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页数：4
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