Physical Review Letters ( IF 8.385 ) Pub Date : 2021-01-13 , DOI: 10.1103/physrevlett.126.026802
Zheng Chen; Zhongran Liu; Yanqiu Sun; Xiaoxin Chen; Yuan Liu; Hui Zhang; Hekang Li; Meng Zhang; Siyuan Hong; Tianshuang Ren; Chao Zhang; He Tian; Yi Zhou; Jirong Sun; Yanwu Xie

We report on the observation of a ${T}_{c}\sim 0.9\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{K}$ superconductivity at the interface between ${\mathrm{LaAlO}}_{3}$ film and the $5d$ transition metal oxide ${\mathrm{KTaO}}_{3}\left(110\right)$ single crystal. The interface shows a large anisotropy of the upper critical field, and its superconducting transition is consistent with a Berezinskii-Kosterlitz-Thouless transition. Both facts suggest that the superconductivity is two-dimensional (2D) in nature. The carrier density measured at 5 K is $\sim 7×{10}^{13}\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{cm}}^{-2}$. The superconducting layer thickness and coherence length are estimated to be $\sim 8$ and $\sim 30\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{nm}$, respectively. Our result provides a new platform for the study of 2D superconductivity at oxide interfaces.

LaAlO3 / KTaO3（110）异质界面处的二维超导

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