Flat band driven itinerant magnetism in the Co-pnictides CaCo$_2$As$_2$ and LaCo$_2$P$_2$
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909866597023744 |
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| author | Subires, D. García-Díez, M. Kar, A. Lim, C. -Y. Li, Victoria M. Yannello, V. Carbone, Dina Gargiani, P. Yilmaz, T. Dai, J. Tallarida, M. Vescovo, E. Shatruk, M. Vergniory, Maia G. Blanco-Canosa, S. |
| author_facet | Subires, D. García-Díez, M. Kar, A. Lim, C. -Y. Li, Victoria M. Yannello, V. Carbone, Dina Gargiani, P. Yilmaz, T. Dai, J. Tallarida, M. Vescovo, E. Shatruk, M. Vergniory, Maia G. Blanco-Canosa, S. |
| contents | Flat bands can induce strong electron correlation effects that help stabilize both magnetic and superconducting states. Here, we carry out angle-resolved photoemission spectroscopy and density functional theory calculations to study the electronic structure of the Co-pnictides CaCo$_2$As$_2$ and LaCo$_2$P$_2$. We find that, while the $k_z$ Fermi topology of ferromagnetic LaCo$_2$P$_2$ is markedly 2-dimensional, antiferromagnetic CaCo$_2$As$_2$ develops a 3D Fermi surface described by a $zig-zag$-like band dispersion perpendicular to the Co-As plane. Furthermore, the magnetism is driven by the electronic correlations of the flat bands with $d_{xy}$ and $d_{z^2}$ orbital character at the Fermi level. Our results link the electronic dimensionality and the magnetic order, and emphasize the critical role of the As-As and P-P bond strength along the $c$-direction to understand the electronic band structure and the rich phase diagram of transition metal pnictides. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_02728 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Flat band driven itinerant magnetism in the Co-pnictides CaCo$_2$As$_2$ and LaCo$_2$P$_2$ Subires, D. García-Díez, M. Kar, A. Lim, C. -Y. Li, Victoria M. Yannello, V. Carbone, Dina Gargiani, P. Yilmaz, T. Dai, J. Tallarida, M. Vescovo, E. Shatruk, M. Vergniory, Maia G. Blanco-Canosa, S. Strongly Correlated Electrons Materials Science Flat bands can induce strong electron correlation effects that help stabilize both magnetic and superconducting states. Here, we carry out angle-resolved photoemission spectroscopy and density functional theory calculations to study the electronic structure of the Co-pnictides CaCo$_2$As$_2$ and LaCo$_2$P$_2$. We find that, while the $k_z$ Fermi topology of ferromagnetic LaCo$_2$P$_2$ is markedly 2-dimensional, antiferromagnetic CaCo$_2$As$_2$ develops a 3D Fermi surface described by a $zig-zag$-like band dispersion perpendicular to the Co-As plane. Furthermore, the magnetism is driven by the electronic correlations of the flat bands with $d_{xy}$ and $d_{z^2}$ orbital character at the Fermi level. Our results link the electronic dimensionality and the magnetic order, and emphasize the critical role of the As-As and P-P bond strength along the $c$-direction to understand the electronic band structure and the rich phase diagram of transition metal pnictides. |
| title | Flat band driven itinerant magnetism in the Co-pnictides CaCo$_2$As$_2$ and LaCo$_2$P$_2$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2503.02728 |