Electronic structures and multi-orbital models of La$_3$Ni$_2$O$_7$ thin films at ambient pressure
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2025
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866915709173366784 |
|---|---|
| author | Hu, Xunwu Qiu, Wenyuan Chen, Cun-Qun Luo, Zhihui Yao, Dao-Xin |
| author_facet | Hu, Xunwu Qiu, Wenyuan Chen, Cun-Qun Luo, Zhihui Yao, Dao-Xin |
| contents | The recent discovery of superconductivity with a transition temperature $T_c$ exceeding 40 K in La$_3$Ni$_2$O$_7$ and (La,Pr)$_{3}$Ni$_2$O$_7$ thin films at ambient pressure marks a significant breakthrough in the field of nickelate superconductors. Using density functional theory (DFT), we propose a double-stacked two-orbital effective model for La$_3$Ni$_2$O$_7$ thin film based on the Ni$-e_g$ orbitals. Our analysis of the Fermi surface reveals three electron pockets ($α,α^{\prime},β$) and two hole pockets ($γ,γ^{\prime}$), where the additional $α^{\prime}$ and $γ^{\prime}$ pockets arise from inter-stack interactions. Furthermore, we introduce a high-energy model that incorporates O$-p$ orbitals to facilitate future studies. Calculations of spin susceptibility within the random phase approximation (RPA) indicate that magnetic correlations are enhanced by nesting of the $γ$ pocket, which is predominantly derived from the Ni$-d_{z^2}$ orbital. Our results provide a theoretical foundation for understanding the electronic and magnetic properties of La$_3$Ni$_2$O$_7$ thin films. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_17223 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electronic structures and multi-orbital models of La$_3$Ni$_2$O$_7$ thin films at ambient pressure Hu, Xunwu Qiu, Wenyuan Chen, Cun-Qun Luo, Zhihui Yao, Dao-Xin Superconductivity The recent discovery of superconductivity with a transition temperature $T_c$ exceeding 40 K in La$_3$Ni$_2$O$_7$ and (La,Pr)$_{3}$Ni$_2$O$_7$ thin films at ambient pressure marks a significant breakthrough in the field of nickelate superconductors. Using density functional theory (DFT), we propose a double-stacked two-orbital effective model for La$_3$Ni$_2$O$_7$ thin film based on the Ni$-e_g$ orbitals. Our analysis of the Fermi surface reveals three electron pockets ($α,α^{\prime},β$) and two hole pockets ($γ,γ^{\prime}$), where the additional $α^{\prime}$ and $γ^{\prime}$ pockets arise from inter-stack interactions. Furthermore, we introduce a high-energy model that incorporates O$-p$ orbitals to facilitate future studies. Calculations of spin susceptibility within the random phase approximation (RPA) indicate that magnetic correlations are enhanced by nesting of the $γ$ pocket, which is predominantly derived from the Ni$-d_{z^2}$ orbital. Our results provide a theoretical foundation for understanding the electronic and magnetic properties of La$_3$Ni$_2$O$_7$ thin films. |
| title | Electronic structures and multi-orbital models of La$_3$Ni$_2$O$_7$ thin films at ambient pressure |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2503.17223 |