Jeff=1/2 Hyperoctagon Lattice in Cobalt Oxalate Metal-Organic Framework

2024/04/10 by Hajime Ishikawa, Shusaku Imajo, Hikaru Takeda +5 · 1 voice
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #Computer science #Condensed matter physics #Crystallography #Frustration #Machine learning #Magnetism #Materials science #Organic and Molecular Conductors Research #Physics #Physics of Superconductivity and Magnetism #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.132.156702

arxiv published 2024/04/10 · arxiv updated 2024/04/10 · openalex publication_date 2024/04/11 · openalex created_date 2024/04/12 · openalex updated_date 2026/08/06

Abstract

We report the magnetic properties of a cobalt oxalate metal-organic framework featuring the hyperoctagon lattice. Our thermodynamic measurements reveal the J_eff=1/2 state of the high-spin Co²⁺ (3d⁷) ion and the two successive magnetic transitions at zero field with two-stage entropy release. ¹³C-NMR measurements reveal the absence of an internal magnetic field in the intermediate temperature phase. Multiple field-induced phases are observed before full saturation at around 40 T. We argue the unique cobalt oxalate network gives rise to the Kitaev interaction and/or a bond frustration effect, providing an unconventional platform for frustrated magnetism on the hyperoctagon lattice.

Citations

• Recent advances in magnetic structure determination by neutron powder diffraction
• VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data
• Anyons in an exactly solved model and beyond
• Vaporization of Kitaev Spin Liquids
• Low-field behavior of anXYpyrochlore antiferromagnet: Emergent clock anisotropies

Discussions

• $J_{\rm{eff}}$ = 1/2 Hyperoctagon Lattice in Cobalt Oxalate Metal-Organic-Framework https://arxiv.org/abs/2404.06923 [bsky, 0 points, 0 comments]

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