Pulsed-laser epitaxy of metallic delafossite PdCrO<sub>2</sub>

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APS March Meeting 2020

Volume 65, Number 1

Monday–Friday, March 2–6, 2020; Denver, Colorado

Session S52: Complex Oxide Films, Surfaces, and Interfaces II

11:15 AM–2:15 PM, Thursday, March 5, 2020
Room: Mile High Ballroom 1E

Sponsoring Unit: DCMP
Chair: Daniel Dougherty, North Carolina State University

Abstract: S52.00013 : Pulsed-laser epitaxy of metallic delafossite PdCrO₂

Abstract

Presenter:

Jong Mok Ok
(Materials Science and Technology Division, Oak Ridge National Lab)

Authors:

Jong Mok Ok
(Materials Science and Technology Division, Oak Ridge National Lab)

Matthew Brahlek
(Materials Science and Technology Division, Oak Ridge National Lab)

Woo Seok Choi
(Department of Physics, Sungkyunkwan University)

Kevin Roccapriore
(Center for Nanophase Materials Sciences, Oak Ridge National Lab)

Matthew F Chisholm
(Center for Nanophase Materials Sciences, Oak Ridge National Lab)

Gaurab Rimal
(Department of Physics and Astronomy, Rutgers University)

Soyeun Kim
(Department of Physics, Ulsan National Institute of Science and Technology)

Changhee Sohn
(Department of Physics, Ulsan National Institute of Science and Technology)

Elizabeth Skoropata
(Materials Science and Technology Division, Oak Ridge National Lab)

Seongshik Oh
(Department of Physics and Astronomy, Rutgers University)

Ho Nyung Lee
(Materials Science and Technology Division, Oak Ridge National Lab)

Within the metallic ABO₂ delafossites, the natural heterostructuring among the A-layers, that are highly-conductive and 2-dimensional, with the triangular and localized nature on the BO₂ is a basic platform for many interesting phenomena. Thin film growth of these materials can enable both tuning basic properties as well as giving new insight into the novel phenomena found in this class of materials, yet this has proven extremely challenging. Here, we report the epitaxial growth of the metallic delafossite PdCrO₂ by pulsed laser deposition (PLD) across many different substrates and epitaxial buffer layers and growth conditions. This work has revealed the fundamental role PLD-growth conditions, epitaxial strain, and chemical and structural character of the substrate play in stabilizing the growth of PdCrO₂. It is found that a low-strain delafossite buffer layer is required to stabilize PdCrO₂. The resulting films are commensurately strained, show very narrow rocking curve widths as low as ~0.1°, and show an antiferromagnetic transition at 40 K that persists down to as thin as 3.6 nm. This works provides key insight for the growth of the boarder class of metallic delafossites and will enable tuning the basic properties of these interesting materials.

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Bulletin of the American Physical Society

APS March Meeting 2020

Volume 65, Number 1

Monday–Friday, March 2–6, 2020; Denver, Colorado

Session S52: Complex Oxide Films, Surfaces, and Interfaces II

Abstract: S52.00013 : Pulsed-laser epitaxy of metallic delafossite PdCrO2

Presenter:

Authors:

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Abstract: S52.00013 : Pulsed-laser epitaxy of metallic delafossite PdCrO₂