FeyTe1-xSex,an archetypical iron-based high-temperature superconductor with a simple structure but rich physical properties,has attracted lots of attention because the two end compositions,Se content x=0 and 1,exhibit antiferromagnetism and nematicity,respectively,making it an ideal candidate for studying their interactions with superconductivity.However,what is clearly lacking to date is a complete phase diagram of FeyTe1-xSex as functions of its chemical compositions since phase separation usually occurs from x～0.6 to 0.9 in bulk crystals.Moreover,fine control of its composition is experimentally challenging because both Te and Se are volatile elements.Here we establish a complete phase diagram of FeyTe1-xSex,achieved by high-throughput film synthesis and characterization techniques.An advanced combinatorial synthesis process enables us to fabricate an epitaxial composition-spread FeyTe1-xSex film encompassing the entire Se content x from 0 to 1 on a single piece of CaF2 substrate.The micro-region composition analysis and X-ray diffraction show a successful continuous tuning of chemical composi-tions and lattice parameters,respectively.The micro-scale pattern technique allows the mapping of elec-trical transport properties as a function of relative Se content with an unprecedented resolution of 0.0074.Combining with the spin patterns in literature,we build a detailed phase diagram that can unify the electronic and magnetic properties of FeyTe1-xSex.Our composition-spread FeyTe1-xSex films,over-coming the challenges of phase separation and precise control of chemical compositions,provide an ideal platform for studying the relationship between superconductivity and magnetism.

Zefeng Lin;Sijia Tu;Juan Xu;Yujun Shi;Beiyi Zhu;Chao Dong;Jie Yuan;Xiaoli Dong;Qihong Chen;Yangmu Li;Kui Jin;Zhongxian Zhao

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China

科学通报（英文版）

[1]Zefeng Lin;Sijia Tu;Juan Xu;Yujun Shi;Beiyi Zhu;Chao Dong;Jie Yuan;Xiaoli Dong;Qihong Chen;Yangmu Li;Kui Jin;Zhongxian Zhao-.Phase diagrams on composition-spread FeyTe1-xSex films)[J].科学通报（英文版）,2022(14):1443-1449

FeyTe1,nematicity

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