A high-throughput method is developed to investigate the superconducting phase diagram of combinatorial(composition-spread)FeSe1-xTex(0≤x≤1)films under electron doping.Composition-spread FeSe1-xTexfilms ...A high-throughput method is developed to investigate the superconducting phase diagram of combinatorial(composition-spread)FeSe1-xTex(0≤x≤1)films under electron doping.Composition-spread FeSe1-xTexfilms are fabricated on single CaF2substrates using combinatorial laser molecular beam epitaxy.An integrated device structure combining ionic-liquid gating with FeSe1-xTex films enables simultaneous transport measurements over the whole composition range.Electrochemical gating significantly enhances the superconducting transition temperature(Tc)in the Se-rich region,reaching values above 40 K.With increasing Te content,both the maximum Tc and the gating efficiency gradually decrease.A comprehensive two-dimensional superconducting phase diagram is constructed as a function of Te content and doping level.These results establish an ideal approach for rapidly exploring the correlation between chemical composition,carrier doping,and superconductivity in Fe-based superconductors.展开更多
基金supported by the National Key R&D Program of China(Grant Nos.2022YFA1403900,2022YFA1403000,2021YFA0718700,and 2022YFA1603900)the National Natural Science Foundation of China(Grant Nos.12504169,12374141,12225412,and 52588301)+2 种基金the Chinese Academy of Sciences(CAS)President’s International Fellowship Initiative(Grant Nos.2024DM0018 and 2025PG0007)the CAS Project for Young Scientists in Basic Research(Grant No.2022YSBR-048)the Open Research Fund of the Pulsed High Magnetic Field Facility,Huazhong University of Science and Technology(Grant No.WHMFC2024001)。
摘要A high-throughput method is developed to investigate the superconducting phase diagram of combinatorial(composition-spread)FeSe1-xTex(0≤x≤1)films under electron doping.Composition-spread FeSe1-xTexfilms are fabricated on single CaF2substrates using combinatorial laser molecular beam epitaxy.An integrated device structure combining ionic-liquid gating with FeSe1-xTex films enables simultaneous transport measurements over the whole composition range.Electrochemical gating significantly enhances the superconducting transition temperature(Tc)in the Se-rich region,reaching values above 40 K.With increasing Te content,both the maximum Tc and the gating efficiency gradually decrease.A comprehensive two-dimensional superconducting phase diagram is constructed as a function of Te content and doping level.These results establish an ideal approach for rapidly exploring the correlation between chemical composition,carrier doping,and superconductivity in Fe-based superconductors.