| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Ultrathin Limit on the Anisotropic Superconductivity of Single-Layered Cuprate Films |
| Feng Ran1,2, Pan Chen1, Dingyi Li1,2, Peiyu Xiong1, Zixin Fan1, Haoming Ling1,2, Yan Liang1, and Jiandi Zhang1,2* |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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| Cite this article: |
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Feng Ran, Pan Chen, Dingyi Li et al 2024 Chin. Phys. Lett. 41 027401 |
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Abstract Exploring dimensionality effects on cuprates is important for understanding the nature of high-temperature superconductivity. By atomically layer-by-layer growth with oxide molecular beam epitaxy, we demonstrate that La$_{2- x}$Sr$_{x}$CuO$_{4}$ ($x = 0.15$) thin films remain superconducting down to 2 unit cells of thickness but quickly reach the maximum superconducting transition temperature at and above 4 unit cells. By fitting the critical magnetic field (${\mu_{0}H}_{\rm c2}$), we show that the anisotropy of the film's superconductivity increases with decreasing film thickness, indicating that the superconductivity of the film gradually evolves from weak three- to two-dimensional character. These results are helpful to gain more insight into the nature of high-temperature superconductivity with dimensionality.
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Received: 06 December 2023
Published: 07 February 2024
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| PACS: |
74.72.-h
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(Cuprate superconductors)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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79.60.-i
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(Photoemission and photoelectron spectra)
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71.70.Ej
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(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
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