Heteroepitaxial Hexagonal (00.1) CuFeO2 Thin Film Grown on Cubic (001) SrTiO3 Substrate Through Translational and Rotational Domain Matching

Sijun Luo, George F. Harrington, Kuan Ting Wu, Daniele Pergolesi, Thomas Lippert

Research output: Contribution to journalArticlepeer-review

1 Citation (SciVal)

Abstract

Heteroepitaxy of complex oxide thin films is a significant challenge when a large mismatch in the lattice parameters (>8%) and difference in the crystallographic symmetry coexist between the film and substrate. Herein, the heteroepitaxial growth of a hexagonal delafossite CuFeO2 thin film with (00.1) orientation on a cubic perovskite (001) SrTiO3 substrate through translational and rotational domain matching epitaxy is reported. The rotational in-plane domain orientation relationships are CuFeO2 [11.0]//SrTiO3 [110] and CuFeO2 [2 (Formula presented.).0]//SrTiO3 [110] with about 10% in-plane lattice mismatch. The 14.8 nm-thick (00.1) CuFeO2 thin film shows high-crystalline quality with a full width at half maximum of rocking curve of about 0.24° and exhibits a possible indirect optical bandgap of 1.43 eV or direct optical bandgap of 1.94 eV. Herein, not only a model system demonstrating translational and rotational domain matching heteroepitaxy of complex oxides is reported, but also a way to thin-film heterostructures integrating hexagonal delafossite with cubic perovskite materials for functional oxide devices is opened.

Original languageEnglish
Article number2100002
JournalPhysica Status Solidi - Rapid Research Letters
Volume15
Issue number6
Early online date4 Apr 2021
DOIs
Publication statusPublished - 1 Jun 2021

Bibliographical note

Funding Information:
The authors gratefully acknowledge the support of the International Institute for Carbon Neutral Energy Research (WPI‐ICNER), sponsored by the World Premier International Research Center Initiative (WPI), MEXT, Japan. G.F.H. gratefully acknowledges financial support from a Kakenhi Grant‐in‐Aid for Young Scientists (B) Award (no. JP18K13992) and the Platform of Inter/ Transdisciplinary Energy Research Support Program (Q‐pit) at Kyushu University. The authors acknowledge the Paul Scherrer Institute (PSI) in Switzerland for support to this work.

Keywords

  • CuFeO
  • heteroepitaxial thin films
  • rotational domain matching
  • SrTiO

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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