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

Calder, S; Vale, JG; Bogdanov, NA; Liu, X; Donnerer, C; Upton, MH; Casa, D; ... Christianson, AD; + view all (2016) Spin-orbit-driven magnetic structure and excitation in the 5d pyrochlore Cd2Os2O7. Nature Communications , 7 , Article 11651. 10.1038/ncomms11651. Green open access

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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.

Type: Article
Title: Spin-orbit-driven magnetic structure and excitation in the 5d pyrochlore Cd2Os2O7
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/ncomms11651
Publisher version: http://dx.doi.org/10.1038/ncomms11651
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Physical sciences, Condensed matter
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1478302
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