Effect of the spin crossover of local copper-oxygen states on the electronic structure of HTSC cuprates
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866911769016926208 |
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| author | Makarov, Ilya Ovchinnikov, Sergey |
| author_facet | Makarov, Ilya Ovchinnikov, Sergey |
| contents | In this work, the effect of uniaxial pressure along the c axis on the electronic structure of the HTSC cuprate La2-xSrxCuO4 is investigated at the doping levels x = 0.1, 0.15, 0.25. The GTB method within the five-band p-d model framework is used to describe the electron system. The uniaxial compression leads to a significant reconstruction of the electronic structure and a change in the character of low-energy quasiparticle excitations: a large contribution of a1g symmetry orbitals appears at the top of the valence band. The crossover between the local Zhang-Rice singlet and the Emery-Reiter triplet was found at the pressure Pc = 15.1 GPa. The characteristic changes in the electronic structure under pressure occur abruptly as a result of the crossover. In particular, the top of the valence band displaces to the region around the k-point (pi,0), the Fermi contour transforms to the four pockets around (0,0),(2pi,0),(0,2pi),(2pi,2pi) and the one contour around (pi,pi). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_00547 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Effect of the spin crossover of local copper-oxygen states on the electronic structure of HTSC cuprates Makarov, Ilya Ovchinnikov, Sergey Strongly Correlated Electrons Superconductivity In this work, the effect of uniaxial pressure along the c axis on the electronic structure of the HTSC cuprate La2-xSrxCuO4 is investigated at the doping levels x = 0.1, 0.15, 0.25. The GTB method within the five-band p-d model framework is used to describe the electron system. The uniaxial compression leads to a significant reconstruction of the electronic structure and a change in the character of low-energy quasiparticle excitations: a large contribution of a1g symmetry orbitals appears at the top of the valence band. The crossover between the local Zhang-Rice singlet and the Emery-Reiter triplet was found at the pressure Pc = 15.1 GPa. The characteristic changes in the electronic structure under pressure occur abruptly as a result of the crossover. In particular, the top of the valence band displaces to the region around the k-point (pi,0), the Fermi contour transforms to the four pockets around (0,0),(2pi,0),(0,2pi),(2pi,2pi) and the one contour around (pi,pi). |
| title | Effect of the spin crossover of local copper-oxygen states on the electronic structure of HTSC cuprates |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2402.00547 |