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Detection of decoupled surface and bulk states in epitaxial orthorhombic SrIrO3 thin films

Authors :
Prescott E. Evans
Takashi Komesu
Le Zhang
Ding-Fu Shao
Andrew J. Yost
Shiv Kumar
Eike F. Schwier
Kenya Shimada
Evgeny Y. Tsymbal
Xia Hong
P. A. Dowben
Source :
AIP Advances, Vol 10, Iss 4, Pp 045027-045027-5 (2020)
Publication Year :
2020
Publisher :
AIP Publishing LLC, 2020.

Abstract

We report the experimental evidence of evolving lattice distortion in high quality epitaxial orthorhombic SrIrO3(001) thin films fully strained on (001) SrTiO3 substrates. Angle-resolved X-ray photoemission spectroscopy studies show that the surface layer of 5 nm SrIrO3 films is Sr–O terminated, and subsequent layers recover the semimetallic state, with the band structure consistent with an orthorhombic SrIrO3(001) having the lattice constant of the substrate. While there is no band folding in the experimental band structure, additional super-periodicity is evident in low energy electron diffraction measurements, suggesting the emergence of a transition layer with crystal symmetry evolving from the SrTiO3 substrate to the SrIrO3(001) surface. Our study sheds light on the misfit relaxation mechanism in epitaxial SrIrO3 thin films in the orthorhombic phase, which is metastable in bulk.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
10
Issue :
4
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.224f7395daf9427e90158f2a01c6db1d
Document Type :
article
Full Text :
https://doi.org/10.1063/1.5135941