MBE synthesis, ARPES and STM characterization of DyBa₂Cu₃O_7-δ thin films

Growth and characterization of HTSC cuprate DyBa₂Cu₃O_7-δ has been achieved in an OASIS system[1], combining together ozone-assisted oxide molecular beam epitaxy (OMBE), angle-resolved photoemission spectroscopy (ARPES), and spectroscopic-imaging scanning tunneling microscopy (SI-STM). Superconducting transition temperature (Tc) of over 80K measured in mutual inductance can be routinely achieved by shuttering via a real-time feedback from RHEED in OMBE. Leveraging on the synergistic capabilities of the instrument, the in-situ grown DyBa₂Cu₃O_7-δ are transferred in-vacuo into ARPES and SI-STM modules for characterization of their electronic properties.Dispersing quasi-particles are observed in photoemission and superconductivity is confirmed in tunneling spectroscopy.

[1] "In-situ ARPES of copper-oxide thin films synthesized by MBE", JESRP (2018),
https://doi.org/10.1016/j.elspec.2018.07.003