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Title: Spin-orbit-driven magnetic structure and excitation in the 5d pyrochlore Cd 2Os 2O 7

Here, much consideration has been given to the role of spin-orbit coupling (SOC) in 5d oxides, particularly on the formation of novel electronic states and manifested metal-insulator transitions (MITs). SOC plays a dominant role in 5d 5 iridates (Ir 4+), undergoing MITs both concurrent (pyrochlores) and separated (perovskites) from the onset of magnetic order. However, the role of SOC for other 5d configurations is less clear. For example, 5d 3 (Os 5+) systems are expected to have an orbital singlet with reduced effective SOC. The pyrochlore Cd 2Os 2O 7 nonetheless exhibits a MIT entwined with magnetic order phenomenologically similar to pyrochlore iridates. Here, we resolve the magnetic structure in Cd 2Os 2O 7 with neutron diffraction and then via resonant inelastic X-ray scattering determine the salient electronic and magnetic energy scales controlling the MIT. In particular, SOC plays a subtle role in creating the electronic ground state but drives the magnetic order and emergence of a multiple spin-flip magnetic excitation.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [6] ;  [7] ;  [6] ;  [8] ;  [8] ;  [8] ;  [9] ;  [9] ;  [10] ;  [5] ;  [11]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  2. Univ. College London (UCL), London (United Kingdom). London Centre for Nanotechnology
  3. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed matter physics and materials science Dept.; Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS)
  5. Univ. College London (UCL), London (United Kingdom). London Centre for Nanotechnology
  6. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  7. Argonne National Laboratory (ANL), Advanced Photon Source (APS)
  8. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  9. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Technische Univ. Dresden (Germany)
  10. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  11. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357; AC02-98CH10886; 2015CB921302; XDB07020200
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Engineering and Physical Sciences Research Council (EPSRC); German Research Foundation (DFG); Ministry of Science and Technology of the People's Republic of China (MOST)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Spintronics; Magnetic properties and materials; Excited states
OSTI Identifier:
1338574