Ruohan Wang, Stanford University

Abstract

Cuprate superconductors, having the highest superconducting transition temperature under ambient pressure in the material family, has been a major focus in condensed matter physics since its discovery. While high-quality single crystals are usually helpful for investigating these materials, certain important phases in cuprates are hardly accessible using bulk synthesis methods. Thin film samples are therefore vital to explore them. Using our oxide molecular beam epitaxy setup at SSRL beamline 5, we synthesized various hole- and electron-doped cuprate structures in thin film forms, including infinite-layer (Ba/Ca)CuO₂, Cu_1-xC_xBa₂CuO_y, and La_2-xCe_xCuO4, which are not stable in bulk. The microscopic electronic structures were studied by performing in situ synchrotron-based angle-resolved photoemission spectroscopy measurements. Our results provide novel material platforms in studying high temperature superconductivity, which are essential for understanding the underlying mechanisms in the future.