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Quasi-two-dimensional magnetism and antiferromagnetic ground state in Li2FeSiO4

Our experimental (neutron diffraction, Mössbauer spectroscopy, magnetic susceptibility, specific heat) and numerical studies on the evolution of short- and long-range magnetic order in 𝛾II−Li2⁢FeSiO4 suggest a quasi-two-dimensional (2D) nature of magnetism. The experimental data obtained on single...

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Main Authors: Hergett, Waldemar (Author) , Bouldi, N. (Author) , Jonak, M. (Author) , Neef, C. (Author) , Ritter, C. (Author) , Abdel-Hafiez, M. (Author) , Seewald, F. (Author) , Klauss, H.-H. (Author) , Haverkort, Maurits W. (Author) , Klingeler, Rüdiger (Author)
Format: Article (Journal)
Language:English
Published: 17 January 2025
In: Physical review
Year: 2025, Volume: 111, Issue: 2, Pages: 1-10
ISSN:2469-9969
DOI:10.1103/PhysRevB.111.024414
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.111.024414
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.111.024414
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Author Notes:W. Hergett, N. Bouldi, M. Jonak, C. Neef, C. Ritter, M. Abdel-Hafiez, F. Seewald, H.-H. Klauss, M.W. Haverkort, and R. Klingeler
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Summary:Our experimental (neutron diffraction, Mössbauer spectroscopy, magnetic susceptibility, specific heat) and numerical studies on the evolution of short- and long-range magnetic order in 𝛾II−Li2⁢FeSiO4 suggest a quasi-two-dimensional (2D) nature of magnetism. The experimental data obtained on single crystals imply long-range antiferromagnetic order below 𝑇N=17 K. A broad maximum in magnetic susceptibility 𝜒 at 𝑇m≃28 K, observation of magnetic entropy changes up to 100 K, and anisotropy in 𝜒 are indicative of low-dimensional magnetism and suggest short-range magnetic correlations up to 200 K. Neutron diffraction shows that long-range antiferromagnetic order is characterized by the propagation vector 𝐤=(12,0,12). The ordered moment 𝜇=2.50⁢(2) 𝜇B/Fe, at 𝑇=1.5 K, is along the crystallographic 𝑎 axis. This is consistent with the observed static hyperfine field of 𝐵hyp=14.8⁢(3)⁢T by Mössbauer spectroscopy which indicates significant orbital contributions. The temperature dependence of 𝐵hyp yields the critical exponent 𝛽=0.116⁢(12) which is in the regime of the 2D Ising behavior. LSDA+U studies exploiting the experimental spin structure suggest dominating magnetic exchange coupling within the 𝑎⁢𝑐 layers (i.e., 𝐽3≃−6 K and 𝐽6≃−2 K) while interlayer coupling is much smaller and partly frustrated. This confirms the 2D nature of magnetism and is in full agreement with the experimental findings.
Item Description:Gesehen am 30.07.2025
Im Titel sind die Zahlen "2" und "4" tiefgestellt
Physical Description:Online Resource
ISSN:2469-9969
DOI:10.1103/PhysRevB.111.024414

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