Electronic structure of Co 3d states in the Kitaev material candidate honeycomb cobaltate Na3Co2SbO6 probed with x-ray dichroism

van Veenendaal, M.; Poldi, E. H. T.; Veiga, L. S. I.; Bencok, P.; Fabbris, Gilberto; Tartaglia, R.; McChesney, J. L.; Freeland, John W.; Hemley, R. J.; Zheng, Hong; Mitchell, John F.; Yan, Jiaqiang; Haskel, Daniel

doi:10.1103/physrevb.107.214443

Electronic structure of Co 3d states in the Kitaev material candidate honeycomb cobaltate Na3 Co2 SbO6 probed with x-ray dichroism

Journal Article · Wed Jun 28 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.214443· OSTI ID:1987546

^[1]; ^[2]; Veiga, L. S. I. ^[3]; Bencok, P. ^[3]; ^[4]; Tartaglia, R. ^[5]; ^[4]; Freeland, John W. ^[4]; Hemley, R. J. ^[6]; Zheng, Hong ^[4]; ^[4]; ^[7]; ^[4]

Northern Illinois University, DeKalb, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); University of Illinois Chicago
University of Illinois Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Diamond Light Source Ltd., Oxfordshire (United Kingdom)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Univ. of Campinas (UNICAMP), Sao Paulo (Brazil); Argonne National Laboratory (ANL), Argonne, IL (United States)
University of Illinois Chicago, IL (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The recent prediction that honeycomb lattices of Co²⁺ (3d⁷) ions could host dominant Kitaev interactions provides an exciting direction for exploration of new routes to stabilizing Kitaev’s quantum spin liquid in real materials. Na₃Co₂SbO₆ has been singled out as a potential material candidate provided that spin and orbital moments couple into a J_eff = $$\frac{1}{2}$$ ground state, and that the relative strength of trigonal crystal field and spin-orbit coupling acting on Co ions can be tailored. Using x-ray linear dichroism (XLD) and x-ray magnetic circular dichroism (XMCD) experiments, alongside configuration interaction calculations, we confirm the counterintuitive positive sign of the trigonal crystal field acting on Co²⁺ ions and test the validity of the J_eff = $$\frac{1}{2}$$ description of the electronic ground state. Furthermore, the results lend experimental support to recent theoretical predictions that a compression (elongation) of CoO₆ octahedra along (perpendicular to) the trigonal axis would drive this cobaltate toward the Kitaev limit, assuming the J_eff = $$\frac{1}{2}$$ character of the electronic ground state is preserved.

View Accepted Manuscript (DOE)

Research Organization:: University of Illinois, Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003975; AC02-06CH11357

OSTI ID:: 1987546

Alternate ID(s):: OSTI ID: 2404541
OSTI ID: 1996646

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 21 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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