Percolative superconductivity in electron-doped Sr1−xEuxCuO2+y films
Xue-Qing Yu, Hang Yan, Li-Xuan Wei, Ze-Xian Deng, Yan-Ling Xiong, Jia-Qi Fan, Pu Yu, Xu-Cun Ma, Qi-Kun Xue, Can-Li Song
DOI 10.1103/PhysRevB.106.L100503 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr1-xEuxCuO2+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | zero_resistance |
| Sr1-xEuxCuO2+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
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