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

S. Nandi, A. Kreyssig, Y. Lee, Yogesh Singh, J. W. Kim, D. C. Johnston, B. N. Harmon, and A. I. Goldman
Phys. Rev. B 79, 100407(R) – Published 27 March 2009

Abstract

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 τ(000.9) 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 ab plane for both magnetic structures. The ICM structure is most likely a spiral-like magnetic structure with a turn angle of 162° (0.9π) between adjacent Eu planes in the c direction. In the CM structure, this angle is 180°. 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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  • Received 5 February 2009

DOI:https://doi.org/10.1103/PhysRevB.79.100407

©2009 American Physical Society

Authors & Affiliations

S. Nandi1, A. Kreyssig1, Y. Lee1, Yogesh Singh1, J. W. Kim2, D. C. Johnston1, B. N. Harmon1, and A. I. Goldman1

  • 1Ames Laboratory, US DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 2Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

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Issue

Vol. 79, Iss. 10 — 1 March 2009

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