Growth of PdCoO2 films with controlled termination by molecular-beam epitaxy and determination of their electronic structure by angle-resolved photoemission spectroscopy
Qi Song,
Jiaxin Sun,
Christopher T. Parzyck,
Ludi Miao,
Qing Xu,
Felix V. E. Hensling,
Matthew R. Barone,
Cheng Hu,
Jinkwon Kim,
Brendan D. Faeth,
Hanjong Paik,
Phil D. C. King,
Kyle M. Shen,
Darrell G. Schlom
Affiliations
Qi Song
Department of Materials Sciences and Engineering, Cornell University, Ithaca, New York 14853, USA
Jiaxin Sun
Department of Materials Sciences and Engineering, Cornell University, Ithaca, New York 14853, USA
Christopher T. Parzyck
Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA
Ludi Miao
Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA
Qing Xu
Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM), Cornell University, Ithaca, New York 14853, USA
Felix V. E. Hensling
Department of Materials Sciences and Engineering, Cornell University, Ithaca, New York 14853, USA
Matthew R. Barone
Department of Materials Sciences and Engineering, Cornell University, Ithaca, New York 14853, USA
Cheng Hu
Department of Materials Sciences and Engineering, Cornell University, Ithaca, New York 14853, USA
Jinkwon Kim
Department of Materials Sciences and Engineering, Cornell University, Ithaca, New York 14853, USA
Brendan D. Faeth
Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM), Cornell University, Ithaca, New York 14853, USA
Hanjong Paik
Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM), Cornell University, Ithaca, New York 14853, USA
Phil D. C. King
SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom
Kyle M. Shen
Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA
Darrell G. Schlom
Department of Materials Sciences and Engineering, Cornell University, Ithaca, New York 14853, USA
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.
