Epitaxial growth and superconductivity of optimally doped Sr1−xEuxCuO2 cuprate films
Hang Yan, Ze-Xian Deng, Jia-Qi Fan, Xue-Qing Yu, Xiao-Peng Hu, Can-Li Song, Xu-Cun Ma, Qi-Kun Xue
DOI 10.1103/PhysRevMaterials.7.074802 · Physical Review Materials
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Abstract
Superconducting infinite-layer Sr1−xEuxCuO2 films at optimal doping (x∼0.15) have been epitaxially grown on SrTiO3(001) substrates with oxide molecular beam epitaxy. By combining x-ray diffraction and transport measurements, we have established a narrow window of growth conditions [i.e., ozone pressure, substrate temperature, (Sr+Eu)/Cu flux ratio, and postannealing] in which the superconducting infinite-layer structure can be readily achieved while eliminating any unwanted competing phases. A smaller out-of-plane lattice constant (c<3.42Å) is found to be crucial to prompt superconductivity in the Sr1−xEuxCuO2 films. Thickness-dependent electrical resistivity measurements reveal superconductivity even when the film thickness is thinned down to 5 nm. Furthermore, the superconducting state of the epitaxial infinite-layer films remains remarkably stable against air exposure, providing an ideal platform to explore the high-temperature superconductivity and unusual properties in cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr1-xEuxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21.3 | Pressure not reported | onset |
| Sr1-xLaxCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | unknown |
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