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  Quantum magnetism of ferromagnetic spin dimers in α- KVOPO4

Mukharjee, P. K., Somesh, K., Ranjith, K. M., Baenitz, M., Skourski, Y., Adroja, D., et al. (2021). Quantum magnetism of ferromagnetic spin dimers in α- KVOPO4. Physical Review B, 104(22): 224409, pp. 1-11. doi:10.1103/PhysRevB.104.224409.

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 Creators:
Mukharjee, Prashanta K.1, Author
Somesh, K.1, Author
Ranjith, K. M.2, Author              
Baenitz, M.3, Author              
Skourski, Y.1, Author
Adroja, D.T.1, Author
Khalyavin, D.1, Author
Tsirlin, A.A.1, Author
Nath, R.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863471              

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Free keywords: Antiferromagnetism; Ferromagnetic materials; Magnetic moments; Magnetic structure; Neutron diffraction, Band structure calculation; Curie-Weiss temperature; Density functionals; Ferromagnetic spin; Ferromagnetics; Neutron density; Ordered magnetic moments; Quantum magnetism; Spin dimer; Thermodynamic measurements, Ferromagnetism
 Abstract: Magnetism of the spin-12α-KVOPO4 is studied by thermodynamic measurements, P31 nuclear magnetic resonance, neutron diffraction, and density-functional band-structure calculations. Ferromagnetic Curie-Weiss temperature of θCW≃15.9 K and the saturation field of μ0Hs≃11.3 T suggest the predominant ferromagnetic coupling augmented by a weaker antiferromagnetic exchange that leads to a short-range order below 5 K and the long-range antiferromagnetic order below TN≃2.7 K in zero field. Magnetic structure with the propagation vector k=(0,12,0) and the ordered magnetic moment of 0.58 μB at 1.5 K exposes a nontrivial spin lattice where strong ferromagnetic dimers are coupled antiferromagnetically. The reduction in the ordered magnetic moment with respect to the classical value (1μB) indicates sizable quantum fluctuations in this setting, despite the predominance of ferromagnetic exchange. We interpret this tendency toward ferromagnetism as arising from the effective orbital order in the folded chains of the VO6 octahedra. © 2021 American Physical Society.

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Language(s): eng - English
 Dates: 2021-12-072021-12-07
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.104.224409
BibTex Citekey: Mukharjee2021
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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: 104 (22) Sequence Number: 224409 Start / End Page: 1 - 11 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008