Molecular beam epitaxy of phase-pure antiperovskite Sr3SnO thin films

Wu, Wangzhou; Combs, Nicholas G.; Stemmer, Susanne

doi:10.1063/5.0068187

Molecular beam epitaxy of phase-pure antiperovskite Sr₃SnO thin films

Journal Article · Mon Oct 18 04:00:00 EDT 2021 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0068187· OSTI ID:1826182

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Univ. of California, Santa Barbara, CA (United States); University of California, Santa Barbara
Univ. of California, Santa Barbara, CA (United States)

The antiperovskite oxide Sr₃SnO has attracted substantial interest due to its topologically non-trivial band structure. Sr-deficient Sr3-xSnO can become superconducting, making it a candidate intrinsic topological superconductor. Here, we show that epitaxial, phase-pure Sr_3-xSnO films can be synthesized by molecular beam epitaxy (MBE) using solid Sr and SnO₂ sources. Here, we show that Sn-rich growth conditions result in a large amount of a Sn-rich impurity phase, which is challenging to detect in x-ray diffraction. Carrier densities and the amount of the impurity phase change systematically with the growth conditions, indicating that MBE provides excellent control over the films' stoichiometry. We discuss the electrical properties, including quantum interference phenomena, which support the topological nature of the films.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0020305

OSTI ID:: 1826182

Alternate ID(s):: OSTI ID: 1826214

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 16 Vol. 119; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Anti-perovskites
Electric measurements
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Electronic band structure
Epitaxy
Interference
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Superconductors
Thin films
X-ray diffraction

Molecular beam epitaxy of phase-pure antiperovskite Sr3SnO thin films

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Molecular beam epitaxy of phase-pure antiperovskite Sr₃SnO thin films