Quasi-two-dimensional magnetism and antiferromagnetic ground state in Li$_2$FeSiO$_4$
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2025
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| author | Hergett, W. Bouldi, N. Jonak, M. Neef, C. Ritter, C. Abdel-Hafiez, M. Seewald, F. Klauss, H. -H. -Haverkort, M. W. Klingeler, R. |
| author_facet | Hergett, W. Bouldi, N. Jonak, M. Neef, C. Ritter, C. Abdel-Hafiez, M. Seewald, F. Klauss, H. -H. -Haverkort, M. W. Klingeler, R. |
| contents | Our experimental (neutron diffraction, Mössbauer spectroscopy, magnetic susceptibility, specific heat) and numerical studies on the evolution of short- and long-range magnetic order in $γ_{\rm II}$-Li\(_2\)FeSiO\(_4\) suggest a quasi-two-dimensional (2D) nature of magnetism. The experimental data obtained on single crystals imply long-range antiferromagnetic order below $T_{\rm N}= 17$~K. A broad maximum in magnetic susceptibility $χ$ at $T_{\rm m}\simeq 28$~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 characterised by the propagation vector k=(1/2,0,1/2). The ordered moment $μ= 2.50(2) μ_B$ /Fe, at $T = 1.5$~K, is along the crystallographic $a$-axis. This is consistent with the observed static hyperfine field of $B_{\rm hyp}=14.8(3)$\,T by Mössbauer spectroscopy which indicates significant orbital contributions. The temperature dependence of $B_{\rm hyp}$ yields the critical exponent $β=0.116(12)$ which is in the regime of the 2D Ising behaviour. LSDA+U studies exploiting the experimental spin structure suggest dominating magnetic exchange coupling within the $ac$-layers (i.e., $J_3\simeq -6$~K and $J_6\simeq-2$~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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_01758 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quasi-two-dimensional magnetism and antiferromagnetic ground state in Li$_2$FeSiO$_4$ Hergett, W. Bouldi, N. Jonak, M. Neef, C. Ritter, C. Abdel-Hafiez, M. Seewald, F. Klauss, H. -H. -Haverkort, M. W. Klingeler, R. Strongly Correlated Electrons Materials Science Our experimental (neutron diffraction, Mössbauer spectroscopy, magnetic susceptibility, specific heat) and numerical studies on the evolution of short- and long-range magnetic order in $γ_{\rm II}$-Li\(_2\)FeSiO\(_4\) suggest a quasi-two-dimensional (2D) nature of magnetism. The experimental data obtained on single crystals imply long-range antiferromagnetic order below $T_{\rm N}= 17$~K. A broad maximum in magnetic susceptibility $χ$ at $T_{\rm m}\simeq 28$~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 characterised by the propagation vector k=(1/2,0,1/2). The ordered moment $μ= 2.50(2) μ_B$ /Fe, at $T = 1.5$~K, is along the crystallographic $a$-axis. This is consistent with the observed static hyperfine field of $B_{\rm hyp}=14.8(3)$\,T by Mössbauer spectroscopy which indicates significant orbital contributions. The temperature dependence of $B_{\rm hyp}$ yields the critical exponent $β=0.116(12)$ which is in the regime of the 2D Ising behaviour. LSDA+U studies exploiting the experimental spin structure suggest dominating magnetic exchange coupling within the $ac$-layers (i.e., $J_3\simeq -6$~K and $J_6\simeq-2$~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. |
| title | Quasi-two-dimensional magnetism and antiferromagnetic ground state in Li$_2$FeSiO$_4$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2501.01758 |