Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session F16: Physics Enabled by Film Growth
8:00 AM–11:00 AM,
Tuesday, March 5, 2024
Room: M100G
Sponsoring
Unit:
DCMP
Chair: Jessica Martins
Abstract: F16.00014 : Surface reconstructions and electronic structure of metallic delafossite thin films*
10:36 AM–10:48 AM
Presenter:
Qi Song
(Cornell University)
Authors:
Qi Song
(Cornell University)
Zhiren He
(Cornell University)
Brendan D Faeth
(Cornell University)
Christopher T Parzyck
(Cornell University)
Anna Scheid
(Max Planck Institute for Solid State Research)
Chad Mowers
(Cornell University)
Qing Xu
(Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials, Cornell University)
Jisung Park
(Cornell University)
Matthew R Barone
(Department of Materials Science and Engineering, Cornell University)
Eren Suyolcu
(Max Planck Institute for Solid State Research)
Peter A van Aken
(Max Planck Institute for Solid State Research)
Betul Pamuk
(Cornell University)
Philip King
(University of St Andrews)
Kyle M Shen
(Cornell University)
Darrell G Schlom
(Cornell University)
Motivated by the potential to create electronic and magnetic characteristics that are not accessible in bulk systems, the study of low-dimensional metallic delafossites with the general chemical formula ABO2 is gaining popularity. Understanding the surface behavior of the delafossite compounds is crucial due to their distinct layer structure, which gives rise to diverse surface states, electronic reconstructions, and surface reconstructions. We study epitaxial PtCoO2, PdCoO2, and PdCrO2 films by combining molecular-beam epitaxy and angle-resolved photoemission spectroscopy. Through precise control of surface termination and treatment, we observed distinct surface reconstructions on the PtCoO2 films, PdCoO2 films, and PdCrO2 films. Notably, these reconstructions have not been reported in prior studies of delafossites. Furthermore, our computational analysis reveals the relative stability of the BO2 surface and the significant reduction in surface formation energy achievable through reconstruction on the A-terminated surface. These experimental and theoretical insights shed light on the surface phenomena occurring in metallic delafossites, paving the way to exploring their distinctive properties in low-dimensional studies.
*The speaker acknowledges the funding support from the Gordon and Betty Moore Foundation's EPiQS Initiative through Grant No. GBMF9073.
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