Enhancement of superconductivity in Sr1−xEuxCuO2+y films with coexisting electron and hole carriers
Hang Yan, Ze-Xian Deng, Xue-Qing Yu, Yan-Ling Xiong, Qun Zhu, Ding Zhang, Can-Li Song, Xu-Cun Ma, Qi-Kun Xue
DOI 10.1103/PhysRevB.111.035405 · Physical Review B
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Abstract
We report transport measurements of infinite-layer cuprate Sr1−xEuxCuO2+y films with controlled electron (by trivalent europium) and hole (by interstitial apical oxygen) carriers grown on SrTiO3(001) with molecular beam epitaxy. An unusual enhancement of superconductivity upon the moderate coexistence of electron and hole carriers in the films is found, which spans over the whole superconducting phase diagram and becomes more prominent in the underdoped regime. The superconductivity exhibits a two-dimensional nature with a thickness of approximately 5.2 nm, irrespective of the varying carriers, confirmed by angle-resolved magnetoresistance measurements and the Berezinskii-Kosterlitz-Thouless transition. Nevertheless, the coexisting electron and hole carriers enlarge the thermal activation energy of vortex motion that deviates obviously from the usual logarithmic evolution with the magnetic field. Our results offer a promising perspective to understand and enhance the high-temperature superconductivity in cuprates.
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. | 29 | Pressure not reported | onset |
| Sr1-xEuxCuO2+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.6 | Pressure not reported | onset |
| Sr1-xEuxCuO2+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21.2 | Pressure not reported | onset |
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