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| Principais autores: | , , , , , , , |
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| Formato: | Preprint |
| Publicado em: |
2026
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| Acesso em linha: | https://arxiv.org/abs/2602.02332 |
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| _version_ | 1866911416565366784 |
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| author | Hergett, Waldemar Ackermann, Kevin Walendy, Erik Spachmann, Sven Jonak, Martin Abdel-Hafiez, Mahmoud Haverkort, Maurits W. Klingeler, R. |
| author_facet | Hergett, Waldemar Ackermann, Kevin Walendy, Erik Spachmann, Sven Jonak, Martin Abdel-Hafiez, Mahmoud Haverkort, Maurits W. Klingeler, R. |
| contents | We report thermal expansion and heat capacity studies on Li$_2$FeSiO$_4$ single crystals which enable us to investigate the critical behavior in the magnetically quasi-two-dimensional (2D) material. Pronounced $λ$-shaped anomalies at the magnetic ordering temperature $T_{\rm N}$ imply significant magneto-elastic coupling. Our analysis of both the thermal expansion and the specific heat data implies the crossover from 2D Ising-like behavior for $|(T-T_{\rm N})/T_{\rm N}|>0.3$ to 3D Ising behavior \rev{below $\simeq 1.3\times T_{\rm N}$. The 2D-like behavior is further supported by density functional calculations which show minimal dispersion perpendicular to the crystallographic $ac$ planes of the layered structure, thereby indicating the 2D nature of magnetism at higher temperatures.} Our results extend the available model materials of quasi-2D magnetism to a high-spin $S=2$ system with tetrahedrally coordinated Fe$^{2+}$-ions, thereby illustrating how magnetic order evolves in a 2D Ising-like system with orbital degrees of freedom. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_02332 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Critical behavior and evidence of dimensional crossover in quasi-two-dimensional Li$_2$FeSiO$_4$ Hergett, Waldemar Ackermann, Kevin Walendy, Erik Spachmann, Sven Jonak, Martin Abdel-Hafiez, Mahmoud Haverkort, Maurits W. Klingeler, R. Strongly Correlated Electrons We report thermal expansion and heat capacity studies on Li$_2$FeSiO$_4$ single crystals which enable us to investigate the critical behavior in the magnetically quasi-two-dimensional (2D) material. Pronounced $λ$-shaped anomalies at the magnetic ordering temperature $T_{\rm N}$ imply significant magneto-elastic coupling. Our analysis of both the thermal expansion and the specific heat data implies the crossover from 2D Ising-like behavior for $|(T-T_{\rm N})/T_{\rm N}|>0.3$ to 3D Ising behavior \rev{below $\simeq 1.3\times T_{\rm N}$. The 2D-like behavior is further supported by density functional calculations which show minimal dispersion perpendicular to the crystallographic $ac$ planes of the layered structure, thereby indicating the 2D nature of magnetism at higher temperatures.} Our results extend the available model materials of quasi-2D magnetism to a high-spin $S=2$ system with tetrahedrally coordinated Fe$^{2+}$-ions, thereby illustrating how magnetic order evolves in a 2D Ising-like system with orbital degrees of freedom. |
| title | Critical behavior and evidence of dimensional crossover in quasi-two-dimensional Li$_2$FeSiO$_4$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2602.02332 |