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Growth of PdCoO2films with controlled termination by molecular-beam epitaxy and determination of their electronic structure by angle-resolved photoemission spectroscopy

Cornell Affiliated Author(s)

Author

Q. Song
J. Sun
C.T. Parzyck
L. Miao
Q. Xu
F.V.E. Hensling
M.R. Barone
C. Hu
J. Kim
B.D. Faeth
H. Paik
P.D.C. King
K.M. Shen
D.G. Schlom

Abstract

Utilizing the powerful combination of molecular-beam epitaxy (MBE) and angle-resolved photoemission spectroscopy (ARPES), we produce and study the effect of different terminating layers on the electronic structure of the metallic delafossite PdCoO2. Attempts to introduce unpaired electrons and synthesize new antiferromagnetic metals akin to the isostructural compound PdCrO2 have been made by replacing cobalt with iron in PdCoO2 films grown by MBE. Using ARPES, we observe similar bulk bands in these PdCoO2 films with Pd-, CoO2-, and FeO2-termination. Nevertheless, Pd- and CoO2-terminated films show a reduced intensity of surface states. Additionally, we are able to epitaxially stabilize PdFexCo1-xO2 films that show an anomaly in the derivative of the electrical resistance with respect to temperature at 20 K, but do not display pronounced magnetic order. © 2022 Author(s).

Date Published

Journal

APL Materials

Volume

10

Issue

9

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85139136307&doi=10.1063%2f5.0101837&partnerID=40&md5=2992ef1aa381dc591d75cc9214ce6deb

DOI

10.1063/5.0101837

Group (Lab)

Kyle Shen Group

Funding Source

DMR-1719875
DMR-2104427
MRI DMR-1338010
FA9550-21-1-0168
DE-SC0002334
NNCI-2025233
714193
DMR-2150446

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