Ferromagnetic Exchange Anisotropy from Antiferromagnetic Superexchange in the Mixed 3d5d Transition-Metal Compound Sr3CuIrO6

Wei-Guo Yin, X. Liu, A. M. Tsvelik, M. P. M. Dean, M. H. Upton, Jungho Kim, D. Casa, A. Said, T. Gog, T. F. Qi, G. Cao, and J. P. Hill
Phys. Rev. Lett. 111, 057202 – Published 2 August 2013
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Abstract

We report a combined experimental and theoretical study of the unusual ferromagnetism in the one-dimensional copper-iridium oxide Sr3CuIrO6. Utilizing Ir L3 edge resonant inelastic x-ray scattering, we reveal a large gap magnetic excitation spectrum. We find that it is caused by an unusual exchange anisotropy generating mechanism, namely, strong ferromagnetic anisotropy arising from antiferromagnetic superexchange, driven by the alternating strong and weak spin-orbit coupling on the 5d Ir and 3d Cu magnetic ions, respectively. From symmetry consideration, this novel mechanism is generally present in systems with edge-sharing Cu2+O4 plaquettes and Ir4+O6 octahedra. Our results point to unusual magnetic behavior to be expected in mixed 3d5d transition-metal compounds via exchange pathways that are absent in pure 3d or 5d compounds.

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  • Received 1 February 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.057202

© 2013 American Physical Society

Authors & Affiliations

Wei-Guo Yin1,*, X. Liu2,1, A. M. Tsvelik1, M. P. M. Dean1, M. H. Upton3, Jungho Kim3, D. Casa3, A. Said3, T. Gog3, T. F. Qi4,5, G. Cao4,5, and J. P. Hill1

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 3Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 4Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA
  • 5Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA

  • *wyin@bnl.gov

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Vol. 111, Iss. 5 — 2 August 2013

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