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Revealing the dual nature of magnetism in iron pnictides and iron chalcogenides using x-ray emission spectroscopy

H. Gretarsson, A. Lupascu, Jungho Kim, D. Casa, T. Gog, W. Wu, S. R. Julian, Z. J. Xu, J. S. Wen, G. D. Gu, R. H. Yuan, Z. G. Chen, N.-L. Wang, S. Khim, K. H. Kim, M. Ishikado, I. Jarrige, S. Shamoto, J.-H. Chu, I. R. Fisher, and Young-June Kim
Phys. Rev. B 84, 100509(R) – Published 22 September 2011

Abstract

We report a Fe Kβ x-ray emission spectroscopy study of local magnetic moments in various iron-based superconductors in their paramagnetic phases. Local magnetic moments are found in all samples studied: PrFeAsO, Ba(Fe,Co)2As2, LiFeAs, Fe1+x(Te,Se), and A2Fe4Se5 (where A=K, Rb, and Cs). The moment size is independent of temperature or carrier concentration but varies significantly across different families. Specifically, all iron pnictide samples have local moments of about 1μB/Fe, while FeTe and K2Fe4Se5 families have much larger local moments of 2μB/Fe and 3.3μB/Fe, respectively. Our results illustrate the importance of multiorbital physics in describing magnetism of these compounds.

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  • Received 30 August 2011

DOI:https://doi.org/10.1103/PhysRevB.84.100509

©2011 American Physical Society

Authors & Affiliations

H. Gretarsson1, A. Lupascu1, Jungho Kim2, D. Casa2, T. Gog2, W. Wu1, S. R. Julian1, Z. J. Xu3, J. S. Wen3, G. D. Gu3, R. H. Yuan4, Z. G. Chen4, N.-L. Wang4, S. Khim5, K. H. Kim5, M. Ishikado6, I. Jarrige6, S. Shamoto6, J.-H. Chu7, I. R. Fisher7, and Young-June Kim1,*

  • 1Department of Physics, University of Toronto, 60 St. George St., Toronto, Ontario M5S 1A7, Canada
  • 2Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 3CMP&MS Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 4Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 5CeNSCMR, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea
  • 6Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1195, Japan
  • 7Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USA

  • *yjkim@physics.utoronto.ca

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Vol. 84, Iss. 10 — 1 September 2011

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