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<p>We report the superconducting properties of tensile-strained infinite-layer cuprate Sr<sub>1−<i>x</i></sub>Eu<sub><i>x</i></sub>CuO<sub>2+<i>y</i></sub> thin films fabricated on KTaO<sub>3</sub> substrates via molecular beam epitaxy. The doping-dependent superconducting phase diagram shows an optimal doping level of <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math> <mi>x</mi> <mspace width="0.25em" /> <mo>∼</mo> </math></EquationSource> <EquationSource Format="TEX">$x\ \sim $</EquationSource> </InlineEquation> 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.</p>

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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

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月24日

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  • Zexian Deng,
  • Hang Yan,
  • Binjie Wu,
  • Yongjie Li,
  • Jiacong Zhang,
  • Zengwei Zhu,
  • Can-Li Song,
  • Xu-Cun Ma,
  • Qi-Kun Xue

摘要

We report the superconducting properties of tensile-strained infinite-layer cuprate Sr1−xEuxCuO2+y thin films fabricated on KTaO3 substrates via molecular beam epitaxy. The doping-dependent superconducting phase diagram shows an optimal doping level of x ∼ $x\ \sim $ 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.