Tensile strain effect on superconductivity and thermally activated vortex motion in $\mathrm{Sr}_{1-x}\mathrm{Eu}_{x}\mathrm{Cu}\mathrm{O}_{2+y}$ thin films

作者：Zexian Deng, Hang Yan, Bo Wu, Yongjie Li, Jiacong Zhang, Zengwei Zhu, Can‐Li Song, Xu-Cun Ma, Qi-Kun Xue · 发表于：Quantum Frontiers · 年份：2025 · DOI：10.1007/s44214-025-00090-8 · 被引用次数：1 · 研究领域：Physics of Superconductivity and Magnetism、Copper-based nanomaterials and applications、Magnetic and transport properties of perovskites and related materials

Abstract We report the superconducting properties of tensile-strained infinite-layer cuprate Sr 1− x Eu x CuO 2+ y thin films fabricated on KTaO 3 substrates via molecular beam epitaxy. The doping-dependent superconducting phase diagram shows an optimal doping level of $x\ \sim $ x ∼ 0.184 and a broader dome shifting to higher doping range due to reduced intralayer hopping and enhanced interlayer magnetic coupling. The characteristic of two-dimensional superconductivity is observed by Berezinskii-Kosterlitz-Thouless transition and the angle-resolved magnetoresistance measurements. Moreover, the temperature-dependent upper critical field and thermally-activated vortex motion under the in-plane and out-of-plane magnetic fields exhibit strong anisotropy, which further reveal the anisotropic nature of the superconductivity in infinite-layer cuprates.