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  Direct determination of the zero-field splitting for the Fe3+ ion in a synthetic polymorph of NaMgFe(C2O4)3·9H2O: A natural metal-organic framework

Xie, T., Nikitin, S. E., Kolesnikov, A. I., Mamontov, E., Anovitz, L. M., Ehlers, G., et al. (2021). Direct determination of the zero-field splitting for the Fe3+ ion in a synthetic polymorph of NaMgFe(C2O4)3·9H2O: A natural metal-organic framework. Physical Review B, 103: 024402, pp. 1-6. doi:10.1103/PhysRevB.103.024402.

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 Creators:
Xie, Tao1, Author
Nikitin, S. E.2, Author              
Kolesnikov, A. I.1, Author
Mamontov, E.1, Author
Anovitz, L. M.1, Author
Ehlers, G.1, Author
Huskić, I.1, Author
Friščić, T.1, Author
Podlesnyak, A.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: We employed inelastic neutron scattering (INS), specific heat, and magnetization analysis to study the magnetism in a synthetic polymorph of the quasi-two-dimensional natural metal-organic framework material, stepanovite NaMgFe(C2O4)3·9H2O. No long-range magnetic order can be observed down to 0.5 K. The INS spectra show two dispersionless excitations at energy transfer 0.028(1) and 0.050(1) meV at base temperature, which are derived from the magnetic transitions between zero-field splitting (ZFS) of S=5/2 ground state multiplets of Fe3+ ion. Further analysis of the INS results shows that the Fe3+ ion has an easy-axis anisotropy with axial ZFS parameter D=-0.0128(5) meV and rhombic parameter E=0.0014(5) meV. The upward behavior at zero field and Schottky-like peak under magnetic field of the low-temperature magnetic specific heat further support the INS results. Our results clearly reveal the magnetic ground and excited state of this stepanovite polymorph. © 2021 American Physical Society.

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Language(s): eng - English
 Dates: 2021-01-042021-01-04
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.103.024402
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 103 Sequence Number: 024402 Start / End Page: 1 - 6 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008