Semi-metallic SrIrO3 films using solid-source metal-organic molecular beam epitaxy

Rashmi Choudhary, Sreejith Nair, Zhifei Yang, Dooyong Lee, Bharat Jalan

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2 Scopus citations


Perovskite SrIrO3 films and its heterostructures are very promising, yet less researched, avenues to explore interesting physics originating from the interplay between strong spin-orbit coupling and electron correlations. Elemental iridium is a commonly used source for molecular beam epitaxy (MBE) synthesis of SrIrO3 films. However, elemental iridium is extremely difficult to oxidize and evaporate while maintaining an ultra-high vacuum and a long mean free path. Here, we calculated a thermodynamic phase diagram to highlight these synthesis challenges for phase-pure SrIrO3 and other iridium-based oxides. We addressed these challenges using a novel solid-source metal-organic MBE approach that rests on the idea of modifying the metal-source chemistry. Phase-pure, single-crystalline, coherent, epitaxial (001)pc SrIrO3 films on (001) SrTiO3 substrate were grown. Films demonstrated semi-metallic behavior, Kondo scattering, and weak antilocalization. Our synthesis approach has the potential to facilitate research involving iridate heterostructures by enabling their atomically precise syntheses.

Original languageEnglish (US)
Article number091118
Pages (from-to)091118
JournalAPL Materials
Issue number9
StatePublished - Sep 1 2022

Bibliographical note

Funding Information:
This work was supported by the Air Force Office of Scientific Research (AFOSR) through Grant Nos. FA9550-21-1-0025 and FA9550-21-0460 and from the NSF through the MRSEC program under Award No. DMR-2011401. R.C. also acknowledges partial support from the U.S. Department of Energy (DOE) through Grant No. DE-SC0020211. Parts of this work were carried out at the Characterization Facility, University of Minnesota, which receives partial support from the NSF through the MRSEC program under Award No. DMR-2011401. Substrate preparation was carried out at the Minnesota Nano Center, which is supported by the NSF through the National Nanotechnology Coordinated Infrastructure under Award No. ECCS-2025124.

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