Spin-orbit-driven magnetic structure and excitation in the 5d pyrochlore Cd2Os2O7

S. Calder (), J. G. Vale, N. A. Bogdanov, X. Liu, C. Donnerer, M. H. Upton, D. Casa, A. H. Said, M. D. Lumsden, Z. Zhao, J. -Q. Yan, D. Mandrus, S. Nishimoto, J. van den Brink, J. P. Hill, D. F. McMorrow and A. D. Christianson
Additional contact information
S. Calder: Oak Ridge National Laboratory
J. G. Vale: London Centre for Nanotechnology, University College London
N. A. Bogdanov: Institute for Theoretical Solid State Physics, IFW Dresden
X. Liu: Brookhaven National Laboratory
C. Donnerer: London Centre for Nanotechnology, University College London
M. H. Upton: Advanced Photon Source, Argonne National Laboratory
D. Casa: Advanced Photon Source, Argonne National Laboratory
A. H. Said: Advanced Photon Source, Argonne National Laboratory
M. D. Lumsden: Oak Ridge National Laboratory
Z. Zhao: University of Tennessee
J. -Q. Yan: University of Tennessee
D. Mandrus: University of Tennessee
S. Nishimoto: Institute for Theoretical Solid State Physics, IFW Dresden
J. van den Brink: Institute for Theoretical Solid State Physics, IFW Dresden
J. P. Hill: Brookhaven National Laboratory
D. F. McMorrow: London Centre for Nanotechnology, University College London
A. D. Christianson: Oak Ridge National Laboratory

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract 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 5d5 iridates (Ir4+), 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, 5d3 (Os5+) systems are expected to have an orbital singlet with reduced effective SOC. The pyrochlore Cd2Os2O7 nonetheless exhibits a MIT entwined with magnetic order phenomenologically similar to pyrochlore iridates. Here, we resolve the magnetic structure in Cd2Os2O7 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.

Date: 2016
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DOI: 10.1038/ncomms11651

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