MBE synthesis and in situ ARPES of epitaxial thin films of the heavy fermion superconductor CeCoIn5

We report the synthesis of superconducting epitaxial thin films of CeCoIn5 by molecular beam epitaxy and the investigation of its electronic structure by in situ ARPES. Epitaxial thin films of CeCoIn5 were synthesized by codeposition on MgF2, with transport characteristics comparable to bulk. Owing to the atomically flat surfaces of the films, in situ ARPES measurements allowed us to reveal a sharp quasiparticle band structure with conspicuous band hybridization and a notable enhancement of the density of states near EF, which may be intrinsically tied to Kondo hybridization. This work provides a possible platform for future studies on thickness-dependent electronic structure evolution, Kondo physics and quantum critical behavior.