Itinerant electron metamagnetism for lattices with van Hove density-of-states singularities near the Fermi level
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| Format: | Preprint |
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2024
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| _version_ | 1866912590878212096 |
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| author | Vasilevskiy, F. A. Igoshev, P. A. Irkhin, V. Yu. |
| author_facet | Vasilevskiy, F. A. Igoshev, P. A. Irkhin, V. Yu. |
| contents | Itinerant-electron metamagnetism is investigated within the Hubbard model for various lattices having van Hove singularities (vHS) in the electronic spectrum: face-centered cubic and orthorhombic lattices. The remarkable itinerant-electron metamagnetic transition occurs provided that the Fermi level is in the region with a strong positive curvature of the density of electron states typically positioned between two close van Hove singularities. Orthorhombic distortion of a~tetragonal lattice is a promising mechanism for generating two closely split vHS with strong density-of-states curvature between them. A phase diagram in terms of electron filling and Hubbard interaction parameter is presented, which shows the paramagnetic-metamagnetic-ferromagnetic phase transition and regions of saturated and non-saturated magnetism. The standard Landau theory expansion based on~the~electron density of states in the vicinity of the Fermi level is demonstrated to be insufficient to describe the whole magnetic phase diagram including the itinerant-electron metamagnetic transition. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_15748 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Itinerant electron metamagnetism for lattices with van Hove density-of-states singularities near the Fermi level Vasilevskiy, F. A. Igoshev, P. A. Irkhin, V. Yu. Strongly Correlated Electrons Materials Science Itinerant-electron metamagnetism is investigated within the Hubbard model for various lattices having van Hove singularities (vHS) in the electronic spectrum: face-centered cubic and orthorhombic lattices. The remarkable itinerant-electron metamagnetic transition occurs provided that the Fermi level is in the region with a strong positive curvature of the density of electron states typically positioned between two close van Hove singularities. Orthorhombic distortion of a~tetragonal lattice is a promising mechanism for generating two closely split vHS with strong density-of-states curvature between them. A phase diagram in terms of electron filling and Hubbard interaction parameter is presented, which shows the paramagnetic-metamagnetic-ferromagnetic phase transition and regions of saturated and non-saturated magnetism. The standard Landau theory expansion based on~the~electron density of states in the vicinity of the Fermi level is demonstrated to be insufficient to describe the whole magnetic phase diagram including the itinerant-electron metamagnetic transition. |
| title | Itinerant electron metamagnetism for lattices with van Hove density-of-states singularities near the Fermi level |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2411.15748 |