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Haldane topological spin-1 chains in a planar metal-organic framework

Author

Listed:
  • Pagnareach Tin

    (University of Tennessee)

  • Michael J. Jenkins

    (University of Tennessee)

  • Jie Xing

    (University of South Carolina)

  • Nils Caci

    (RWTH Aachen University)

  • Zheng Gai

    (Oak Ridge National Laboratory)

  • Rongyin Jin

    (University of South Carolina)

  • Stefan Wessel

    (RWTH Aachen University)

  • J. Krzystek

    (Florida State University)

  • Cheng Li

    (Oak Ridge National Laboratory)

  • Luke L. Daemen

    (Oak Ridge National Laboratory)

  • Yongqiang Cheng

    (Oak Ridge National Laboratory)

  • Zi-Ling Xue

    (University of Tennessee)

Abstract

Haldane topological materials contain unique antiferromagnetic chains with symmetry-protected energy gaps. Such materials have potential applications in spintronics and future quantum computers. Haldane topological solids typically consist of spin-1 chains embedded in extended three-dimensional (3D) crystal structures. Here, we demonstrate that [Ni(μ−4,4′-bipyridine)(μ-oxalate)]n (NiBO) instead adopts a two-dimensional (2D) metal-organic framework (MOF) structure of Ni2+ spin-1 chains weakly linked by 4,4′-bipyridine. NiBO exhibits Haldane topological properties with a gap between the singlet ground state and the triplet excited state. The latter is split by weak axial and rhombic anisotropies. Several experimental probes, including single-crystal X-ray diffraction, variable-temperature powder neutron diffraction (VT-PND), VT inelastic neutron scattering (VT-INS), DC susceptibility and specific heat measurements, high-field electron spin resonance, and unbiased quantum Monte Carlo simulations, provide a detailed, comprehensive characterization of NiBO. Vibrational (also known as phonon) properties of NiBO have been probed by INS and density-functional theory (DFT) calculations, indicating the absence of phonons near magnetic excitations in NiBO, suppressing spin-phonon coupling. The work here demonstrates that NiBO is indeed a rare 2D-MOF Haldane topological material.

Suggested Citation

  • Pagnareach Tin & Michael J. Jenkins & Jie Xing & Nils Caci & Zheng Gai & Rongyin Jin & Stefan Wessel & J. Krzystek & Cheng Li & Luke L. Daemen & Yongqiang Cheng & Zi-Ling Xue, 2023. "Haldane topological spin-1 chains in a planar metal-organic framework," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41014-1
    DOI: 10.1038/s41467-023-41014-1
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    Cited by:

    1. A. Jażdżewska & M. Mierzejewski & M. Środa & A. Nocera & G. Alvarez & E. Dagotto & J. Herbrych, 2023. "Transition to the Haldane phase driven by electron-electron correlations," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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