$J_{\rm{eff}}$ = 1/2 Hyperoctagon Lattice in Cobalt Oxalate Metal-Organic-Framework

Hajime Ishikawa; Shusaku Imajo; Hikaru Takeda; Masafumi Kakegawa; Minoru Yamashita; Jun-ichi Yamaura; Koichi Kindo

doi:10.1103/PhysRevLett.132.156702

$J_{\rm{eff}}$ = 1/2 Hyperoctagon Lattice in Cobalt Oxalate Metal-Organic-Framework

Strongly Correlated Electrons 2024-04-11 v1 Materials Science

Authors: Hajime Ishikawa , Shusaku Imajo , Hikaru Takeda , Masafumi Kakegawa , Minoru Yamashita , Jun-ichi Yamaura , Koichi Kindo

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Abstract

We report the magnetic properties of a cobalt oxalate metal-organic-framework featuring the hyperoctagon lattice. Our thermodynamic measurements reveal the $J_{\rm{eff}}$ = 1/2 state of the high-spin Co $^{2+}$ (3 $\textit{d}^{7}$ ) ion and the two successive magnetic transitions at zero field with two-stage entropy release. $^{13}$ C-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.

Keywords

hyperoctagon lattice cobalt oxalate metal-organic framework $J_{\rm{eff}}$ = 1/2 Kitaev interaction frustrated magnetism

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@article{arxiv.2404.06923,
  title  = {$J_{\rm{eff}}$ = 1/2 Hyperoctagon Lattice in Cobalt Oxalate Metal-Organic-Framework},
  author = {Hajime Ishikawa and Shusaku Imajo and Hikaru Takeda and Masafumi Kakegawa and Minoru Yamashita and Jun-ichi Yamaura and Koichi Kindo},
  journal= {arXiv preprint arXiv:2404.06923},
  year   = {2024}
}

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6 pages, 4 figures

$J_{\rm{eff}}$ = 1/2 Hyperoctagon Lattice in Cobalt Oxalate Metal-Organic-Framework

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