Searching for a route to synthesize in situ epitaxial Pr2Ir2O7 thin films with thermodynamic methods

Guo, Lu; Shang, Shun-Li; Campbell, Neil; Evans, Paul G.; Rzchowski, Mark; Liu, Zi-Kui; Eom, Chang-Beom

doi:10.1038/s41524-021-00610-9

Title: Searching for a route to synthesize in situ epitaxial Pr₂Ir₂O₇ thin films with thermodynamic methods

Journal Article · Thu Sep 09 00:00:00 EDT 2021 · npj Computational Materials

DOI:https://doi.org/10.1038/s41524-021-00610-9· OSTI ID:1849706

Guo, Lu;

; Campbell, Neil; Evans, Paul G.; Rzchowski, Mark; Liu, Zi-Kui;

In situ growth of pyrochlore iridate thin films has been a long-standing challenge due to the low reactivity of Ir at low temperatures and the vaporization of volatile gas species such as IrO₃(g) and IrO₂(g) at high temperatures and high P_O2. To address this challenge, we combine thermodynamic analysis of the Pr-Ir-O₂system with experimental results from the conventional physical vapor deposition (PVD) technique of co-sputtering. Our results indicate that only high growth temperatures yield films with crystallinity sufficient for utilizing and tailoring the desired topological electronic properties and the in situ synthesis of Pr₂Ir₂O₇thin films is fettered by the inability to grow with P_O2on the order of 10 Torr at high temperatures, a limitation inherent to the PVD process. Thus, we suggest techniques capable of supplying high partial pressure of key species during deposition, in particular chemical vapor deposition (CVD), as a route to synthesis of Pr₂Ir₂O₇.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-06ER46327; AC02-05CH11231

OSTI ID:: 1849706

Journal Information:: npj Computational Materials, Vol. 7, Issue 1; ISSN 2057-3960

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

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