Percolative superconductivity in electron-doped Sr1-xEuxCuO2+y films

Yu，Xue Qing1; Yan，Hang1; Wei，Li Xuan1; Deng，Ze Xian1; Xiong，Yan Ling1; Fan，Jia Qi1; Yu，Pu1,2; Ma，Xu Cun1,2; Xue，Qi Kun1,2,3,4; Song，Can Li1,2

2022-09-01

10.1103/PhysRevB.106.L100503

Physical Review B   Impact Factor & Quartile

2469-9950

2469-9969

Electron-doped infinite-layer Sr1-xEuxCuO2+y films over a wide doping range have been prepared epitaxially on SrTiO3(001) using reactive molecular beam epitaxy. In-plane transport measurements of the single-crystalline samples reveal a dome-shaped nodeless superconducting phase centered at x∼ 0.15, a Fermi-liquid behavior and pronounced upturn in low-temperature resistivity. We show that the resistivity upturn follows square-root temperature dependence, suggesting the emergence of superconductivity via a three-dimensional percolation process. The percolative superconductivity is corroborated spectroscopically by imaging the electronic phase separation between superconducting and metallic phases with low-temperature scanning tunneling microscopy. Furthermore, we visualize interstitial and apical oxygen anions that rapidly increase in number as x> 0.12 and elucidate their impacts on the superconductivity and normal-state resistivity.

English

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2-s2.0-85139388492

Scopus

1.State Key Laboratory of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing,100084,China
2.Frontier Science Center for Quantum Information,Beijing,100084,China
3.Beijing Academy of Quantum Information Sciences,Beijing,100193,China
4.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China

Yu，Xue Qing,Yan，Hang,Wei，Li Xuan,et al. Percolative superconductivity in electron-doped Sr1-xEuxCuO2+y films[J]. Physical Review B,2022,106(10).

Yu，Xue Qing.,Yan，Hang.,Wei，Li Xuan.,Deng，Ze Xian.,Xiong，Yan Ling.,...&Song，Can Li.(2022).Percolative superconductivity in electron-doped Sr1-xEuxCuO2+y films.Physical Review B,106(10).

Yu，Xue Qing,et al."Percolative superconductivity in electron-doped Sr1-xEuxCuO2+y films".Physical Review B 106.10(2022).