A superconducting half-dome in bilayer nickelates
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2026
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866911509312962560 |
|---|---|
| author | Liu, Yidi Wang, Bai Yang Li, Jiarui Tarn, Yaoju Bhatt, Lopa Colletta, Michael Wu, Yi-Ming Kuo, Cheng-Tai Lee, Jun-Sik Goodge, Berit H. Muller, David A. Shen, Zhi-Xun Raghu, Srinivas Hwang, Harold Y. Yu, Yijun |
| author_facet | Liu, Yidi Wang, Bai Yang Li, Jiarui Tarn, Yaoju Bhatt, Lopa Colletta, Michael Wu, Yi-Ming Kuo, Cheng-Tai Lee, Jun-Sik Goodge, Berit H. Muller, David A. Shen, Zhi-Xun Raghu, Srinivas Hwang, Harold Y. Yu, Yijun |
| contents | Understanding how superconductivity emerges and collapses in correlated electron systems remains a central challenge in condensed matter physics. As a recently discovered member of the high temperature superconductor family, bilayer nickelates provide a new opportunity for examining this problem. Their pronounced sensitivity to oxygen stoichiometry, while posing challenges for stabilizing superconductivity, simultaneously offers an effective control parameter for tuning electronic phases. Here we report a superconducting half-dome in compressively strained bilayer nickelate thin films as a function of continuous tuning of oxygen stoichiometry. Starting from an optimally superconducting state, increasing oxygen stoichiometry gradually suppresses superconductivity toward a metallic phase, whereas decreasing oxygen stoichiometry drives a granular superconductor-to-insulator transition while leaving the superconducting onset intact. This half-dome structure can be understood to arise from the contrasting roles played by interstitial oxygen versus oxygen vacancies - namely the dominance of doping versus scattering. Notably, the half-dome emerges consistently across samples with different rare-earth combinations, with or without alkaline-earth doping, revealing a general feature of the bilayer nickelate phase diagram. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_12196 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A superconducting half-dome in bilayer nickelates Liu, Yidi Wang, Bai Yang Li, Jiarui Tarn, Yaoju Bhatt, Lopa Colletta, Michael Wu, Yi-Ming Kuo, Cheng-Tai Lee, Jun-Sik Goodge, Berit H. Muller, David A. Shen, Zhi-Xun Raghu, Srinivas Hwang, Harold Y. Yu, Yijun Superconductivity Understanding how superconductivity emerges and collapses in correlated electron systems remains a central challenge in condensed matter physics. As a recently discovered member of the high temperature superconductor family, bilayer nickelates provide a new opportunity for examining this problem. Their pronounced sensitivity to oxygen stoichiometry, while posing challenges for stabilizing superconductivity, simultaneously offers an effective control parameter for tuning electronic phases. Here we report a superconducting half-dome in compressively strained bilayer nickelate thin films as a function of continuous tuning of oxygen stoichiometry. Starting from an optimally superconducting state, increasing oxygen stoichiometry gradually suppresses superconductivity toward a metallic phase, whereas decreasing oxygen stoichiometry drives a granular superconductor-to-insulator transition while leaving the superconducting onset intact. This half-dome structure can be understood to arise from the contrasting roles played by interstitial oxygen versus oxygen vacancies - namely the dominance of doping versus scattering. Notably, the half-dome emerges consistently across samples with different rare-earth combinations, with or without alkaline-earth doping, revealing a general feature of the bilayer nickelate phase diagram. |
| title | A superconducting half-dome in bilayer nickelates |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2603.12196 |