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

Calder, Stuart A; Vale, James G.; Bogdanov, Nikolay; Liu, Xeurong; Donnerer, Christian; Upton, Mary; Casa, Diego; Ayman, Said; Lumsden, M. D.; Zhao, Zhiying; Yan, J. -Q.; Mandrus, David; Satoshi, Nishimoto; Van den Brink, Jeroen; Hill, John P; McMorrow, D. F.; Christianson, Andrew D

doi:10.1038/ncomms11651

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

Journal Article · Tue Jun 07 00:00:00 EDT 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms11651· OSTI ID:1338574

Calder, Stuart A ^[1]; Vale, James G. ^[2]; Bogdanov, Nikolay ^[3]; Liu, Xeurong ^[4]; Donnerer, Christian ^[5]; Upton, Mary ^[6]; Casa, Diego ^[6]; Ayman, Said ^[7]; Lumsden, M. D. ^[6]; Zhao, Zhiying ^[8]; Yan, J. -Q. ^[8]; Mandrus, David ^[8]; Satoshi, Nishimoto ^[9]; Van den Brink, Jeroen ^[9]; Hill, John P ^[10]; McMorrow, D. F. ^[5]; Christianson, Andrew D ^[11]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Univ. College London (UCL), London (United Kingdom). London Centre for Nanotechnology
Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
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)
Univ. College London (UCL), London (United Kingdom). London Centre for Nanotechnology
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Argonne National Laboratory (ANL), Advanced Photon Source (APS)
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
Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Technische Univ. Dresden (Germany)
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
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

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 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Engineering and Physical Sciences Research Council (EPSRC); German Research Foundation (DFG); Ministry of Science and Technology of the People's Republic of China (MOST)

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357; AC02-98CH10886; 2015CB921302; XDB07020200

OSTI ID:: 1338574

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 51 works

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