Journal
PHYSICAL REVIEW MATERIALS
Volume 7, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.7.024001
Keywords
-
Categories
Ask authors/readers for more resources
Epitaxial PdCoO2 thin films with high crystalline quality and bipolar surface with mixed termination were studied using in situ angle-resolved photoemission spectroscopy. A surprisingly prominent bulklike single hexagonal large Fermi surface with suppressed surface state was observed. The sharp Fermi surface observation relies on the minimized atomic scale disorder in the high-quality film surface. The predominantly two-dimensional bulk electronic state with the Fermi group velocity parallel to the plane of PdCoO2 makes the near-surface bulklike state less sensitive to the scattering by longer length scale random bipolar surface potentials. These findings are invaluable for accelerating the search for exotic functionalities in epitaxial ultrathin films and heterostructures of metallic delafossites.
Epitaxial thin films of metallic delafossites are a recent topic of intense investigation due to their intriguing electronic states. Using in situ angle-resolved photoemission spectroscopy, we investigated the electronic states of epitaxial PdCoO2 thin films with high crystalline quality and bipolar surface with mixed termination. On this characteristic surface, we observed a surprisingly prominent bulklike single hexagonal large Fermi surface with suppressed surface state. Firstly, observation of a sharp Fermi surface relies on the minimized atomic scale disorder in our high-quality film surface. Additionally, the predominantly two-dimensional bulk electronic state with the Fermi group velocity parallel to the plane of PdCoO2 is expected to make the near-surface bulklike state less sensitive to the scattering by longer length scale random bipolar surface potentials. Furthermore, the origin of the suppressed surface state can be interpreted by screening of the polarity on the surface, which is qualitatively supported by density functional theory calculation. These findings are invaluable for accelerating the search for exotic functionalities in epitaxial ultrathin films and heterostructures of metallic delafossites.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available