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

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
JournalPhysica Status Solidi - Rapid Research Letters
DOIs
Publication statusAccepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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