Magnetic order in single crystals of Na3Co2SbO6 with a honeycomb arrangement of 3d7Co2+ ions

Yan, Jiaqiang; Okamoto, Satoshi; Wu, Yan; Zheng, Qiang; Zhou, Haidong; Cao, Huibo; McGuire, Michael A.

doi:10.1103/PhysRevMaterials.3.074405

Title: Magnetic order in single crystals of Na₃Co₂SbO₆ with a honeycomb arrangement of 3d⁷Co²⁺ ions

Journal Article · Mon Jul 15 00:00:00 EDT 2019 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.3.074405· OSTI ID:1543231

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)

We have synthesized single crystals of Na₃Co₂SbO₆ and characterized the structure and magnetic order by measuring anisotropic magnetic properties, heat capacity, and x-ray and neutron single crystal diffraction. Magnetic properties and specific heat of polycrystalline Na₃Co₂SbO₆ were also measured for comparison. Na₃Co₂SbO₆ crystallizes in a monoclinic structure (space group C₂/m) with [Co₂SbO₆]^3- layers separated by Na⁺ ions. The temperature dependence of magnetic susceptibility shows significant anisotropic behavior in the whole temperature range 2–350 K investigated in this work. An effective moment of about 5.5μ_B/Co²⁺ from a Curie-Weiss fitting of the magnetic susceptibility is larger than the spin only value and signals significant orbital contribution. Na₃Co₂SbO₆ single crystal undergoes a transition into a long-range antiferromagnetically ordered state below T_N = 5K. Neutron single crystal diffraction confirmed the zigzag magnetic structure with a propagation vector k = (0.5,0.5,0). The ordered moment is found to be 0.9 μ_B at 4 K and align along the crystallographic b axis. Density functional theory calculations suggest that the experimentally observed zigzag order is energetically competing with the Néel order. Furthermore, it is also found that the covalency between Co d and O p is quite strong and competes with the local spin-orbit coupling, suggesting a J_eff = 1/2 ground state may not be realized in this compound.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1543231

Alternate ID(s):: OSTI ID: 1546438

Journal Information:: Physical Review Materials, Vol. 3, Issue 7; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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