Two-Dimensional Superconductivity at the CaZrO3/KTaO3 (001) Heterointerfaces

[2507.01392] Two-Dimensional Superconductivity at the CaZrO3/KTaO3 (001) Heterointerfaces Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Condensed Matter > Superconductivity arXiv:2507.01392 (cond-mat) [Submitted on 2 Jul 2025 ( v1 ), last revised 9 Apr 2026 (this version, v2)] Title: Two-Dimensional Superconductivity at the CaZrO3/KTaO3 (001) Heterointerfaces Authors: Lu Chen , Siyi Zhou , Daming Tian , Yinan Xiao , Qixuan Gao , Yongchao Wang , Yuansha Chen , Fengxia Hu , Baogen Shen , Jirong Sun , Weisheng Zhao , Jinsong Zhang , Hui Zhang View a PDF of the paper titled Two-Dimensional Superconductivity at the CaZrO3/KTaO3 (001) Heterointerfaces, by Lu Chen and 12 other authors View PDF Abstract: Two-dimensional superconductivity at KTaO3 (KTO) heterointerfaces has sparked intensive investigations since its discovery, yet whether the (001)-oriented KTO interface hosts superconductivity remains to be elucidated. Here, we provide unambiguous evidence of superconductivity in two-dimensional electron gases (2DEGs) at CaZrO3/KTO(001) heterointerfaces, with a superconducting transition TC up to ~0.25 K. Notably, TC increases linearly with carrier density nS over the range of 4.5*10^13~10.3*10^13 cm^-2. Furthermore, superconductivity exhibits a pronounced dependence on crystallographic orientation, with TC rising from 0.25 K for (001) to 1.04 K for (110) and 2.22 K for (111), underscoring the crucial role of interfacial symmetry in the CaZrO3/KTO system. The two-dimensional nature of the superconducting state is corroborated by the Berezinskii-Kosterlitz-Thouless (BKT) transition and the large anisotropy of the upper critical field. For the CaZrO3/KTO(001) sample with nS=7.7*10^13 cm^-2, the estimated Ginzburg-Landau coherence length {\xi}GL=146.4 nm is larger than the superconducting layer thickness dSC=10.1 nm by a factor of ~14.5, confirming significant two-dimensional confinement of the CaZrO3/KTO(001) superconductor. In addition, we demonstrate that the two-dimensional superconductivity at the CaZrO3/KTO(001) interface can be effectively tuned by applying a back gate voltage. Our findings reveal the existence of two-dimensional superconductivity at CaZrO3/KTO(001), providing a new platform for exploring two-dimensional superconductivity at oxide interfaces. Comments: 27 Pages,5 figures Subjects: Superconductivity (cond-mat.supr-con) Cite as: arXiv:2507.01392 [cond-mat.supr-con] (or arXiv:2507.01392v2 [cond-mat.supr-con] for this version) https://doi.org/10.48550/arXiv.2507.01392 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Hui Zhang [ view email ] [v1] Wed, 2 Jul 2025 06:13:52 UTC (1,596 KB) [v2] Thu, 9 Apr 2026 06:09:57 UTC (1,679 KB) Full-text links: Access Paper: View a PDF of the paper titled Two-Dimensional Superconductivity at the CaZrO3/KTaO3 (001) Heterointerfaces, by Lu Chen and 12 other authors View PDF view license Current browse context: cond-mat.supr-con < prev | next > new | recent | 2025-07 Change to browse by: cond-mat References & Citations NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... 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