Magnetic structures and interplay between rare-earth Ce and Fe magnetism in single-crystal CeFeAsO

Qiang Zhang, Wei Tian, Haifeng Li, Jong-Woo Kim, Jiaqiang Yan, R. William McCallum, Thomas A. Lograsso, Jerel L. Zarestky, Sergey L. Bud'ko, Robert J. McQueeney, and David Vaknin
Phys. Rev. B 88, 174517 – Published 27 November 2013

Abstract

Neutron and synchrotron resonant x-ray magnetic scattering (RXMS) complemented by heat capacity and resistivity measurements reveal the evolution of the magnetic structures of Fe and Ce sublattices in a CeFeAsO single crystal. The RXMS of magnetic reflections at the Ce LII edge shows a magnetic transition that is specific to the Ce antiferromagnetic long-range ordering at TCe 4 K with short-range Ce ordering above TCe, whereas neutron diffraction measurements of a few magnetic reflections indicate a transition at T* 12 K with an unusual order parameter. Detailed order-parameter measurements on several magnetic reflections by neutrons show a weak anomaly at 4 K that we associate with the Ce ordering. The successive transitions at TCe and T* can also be clearly identified by two anomalies in heat capacity and resistivity measurements. The higher transition temperature at T* 12 K is mainly ascribed to Fe spin reorientation transition, below which Fe spins rotate uniformly and gradually in the ab plane. The Fe spin reorientation transition and short-range Ce ordering above TCe reflect the strong Fe-Ce couplings prior to long-range ordering of the Ce. The evolution of the intricate magnetic structures in CeFeAsO going through T* and TCe is proposed.

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  • Received 12 July 2013

DOI:https://doi.org/10.1103/PhysRevB.88.174517

©2013 American Physical Society

Authors & Affiliations

Qiang Zhang1,2,*, Wei Tian1,3, Haifeng Li1,2, Jong-Woo Kim4, Jiaqiang Yan1,3,5, R. William McCallum1,6, Thomas A. Lograsso1,6, Jerel L. Zarestky1, Sergey L. Bud'ko1,2, Robert J. McQueeney1,2, and David Vaknin1,2,†

  • 1Ames Laboratory, Ames, Iowa 50011, USA
  • 2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 3Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 4Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 6Department of Materials Sciences and Engineering, Iowa State University, Ames, Iowa 50011, USA

  • *qzhangemail@gmail.com
  • vaknin@ameslab.gov

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Issue

Vol. 88, Iss. 17 — 1 November 2013

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