首页|Significantly enhanced superconductivity in monolayer FeSe films on SrTiO3(001)via metallic δ-doping

Significantly enhanced superconductivity in monolayer FeSe films on SrTiO3(001)via metallic δ-doping

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Superconductivity transition temperature(Tc)marks the inception of a macroscopic quantum phase-coherent paired state in fermionic systems.For 2D superconductivity,the paired electrons condense into a coherent superfluid state at Tc,which is usually lower than the pairing temperature,between which intrinsic physics including Berezinskii-Kosterlitz-Thouless transition and pseudogap state are hotly debated.In the case of monolayer FeSe superconducting films on SrTiO3(001),although the pairing temperature(Tp)is revealed to be 65-83 Kby using spectroscopy characterization,the measured zero-resistance temperature(Tc0)is limited to 20 K.Here,we report significantly enhanced superconductivity in monolayer FeSe filmsby δ-doping of Eu or Al on SrTiO3(001)surface,in which T0 is enhanced by 12 K with a narrowed transition width ΔTc～8 K,compared with non-doped samples.Using scanning tunneling microscopy/spectroscopy measurements,we demonstrate lowered work function of theδ-doped SrTiO3(001)surface and enlarged superconducting gaps in the monolayer FeSe with improved morphology/electronic homogeneity.Our work provides a practical route to enhance 2D superconductivity by using interface engineering.

monolayer FeSeinterface superconductivityδ-dopingzero-resistance temperaturesuperconductivity transition temperature

Xiaotong Jiao、Wenfeng Dong、Mingxia Shi、Heng Wang、Cui Ding、Zhongxu Wei、Guanming Gong、Yanan Li、Yuanzhao Li、Binjie Zuo、Jian Wang、Ding Zhang、Minghu Pan、Lili Wang、Qi-Kun Xue

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State Key Laboratory of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084,China

School of Physics &Information Technology,Shaanxi Normal University,Xi'an 710119,China

Beijing Academy of Quantum Information Sciences,Beijing 100193,China

Department of Physics,Southern University of Science and Technology,Shenzhen 518055,China

International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China

Department of Physics,The Pennsylvania State University,University Park,PA 16802,USA

Collaborative Innovation Center of Quantum Matter,Beijing 100871,China

Hefei National Laboratory,Hefei 230088,China

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State Key Laboratory of Low-Dimensional Quantum PhysicsDepartment of Physics of Tsinghua University国家重点研发计划国家重点研发计划国家重点研发计划国家自然科学基金国家自然科学基金Basic and Applied Basic Research Major Programme of Guangdong Province,ChinaJihua Laboratory国家自然科学基金Innovation Program for Quantum Science and Technology

2022YFA14031002022YFA14031012022YFA140310212074210517881042021B0301030003X210141TL210118881012021ZD0302400

2024

10.1093/nsr/nwad213

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年,卷(期)：2024.11(3)
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