Infinite layer Sr1-xLaxCuO2+δ is a prototype to study the high-Tc superconductivity in cuprates. Using oxide-MBE technique, we fabricate Sr1-xLaxCuO2+δ films with different doping levels. Mottness has been observed in lightly electron-doped Sr1-xLaxCuO2 by in-situ STM. We also find a phase transition to hole-doped Sr1-xLaxCuO2+δ when x exceeds 0.1. Apical oxygens are responsible for this electron- to hole-cuprate transition, which is supported by transmission electron microscope measurements. By comparing the electronic structures in electron- and hole-doped Sr1-xLaxCuO2+δ, we give some clues to understand the e-h asymmetry in cuprates.This work is financially supported by the Ministry of Science and Technology of China (Grants No. 2017YFA0304600, 2015CB921001, 2016YFA0301004), the National Natural Science Foundation of China (Grants No. 11427903, 11504196, 11634007, 11774192), and in part by the Beijing Advanced Innovation Center for Future Chip (ICFC).
APS March Meeting Abstracts
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