Optimization of La2–xSrxCuO4 Single Crystal Film Growth via Molecular Beam Epitaxy

He, Xi; Xu, Xiaotao; Shi, Xiaoyan; Božović, Ivan

doi:10.3390/condmat8010013

Title: Optimization of La_2–xSr_xCuO₄ Single Crystal Film Growth via Molecular Beam Epitaxy

Journal Article · Fri Jan 20 00:00:00 EST 2023 · Condensed Matter

DOI:https://doi.org/10.3390/condmat8010013· OSTI ID:1922462

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Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Texas at Dallas, Richardson, TX (United States)
Univ. of Texas at Dallas, Richardson, TX (United States)

Atomic layer-by-layer molecular beam epitaxy (ALL-MBE) combined with ozone is one of the best methods to fabricate single-crystal thin films of complex oxides. Cuprate such as La_2-xSr_xCuO₄ (LSCO) is a representative complex-oxide high-temperature superconductor (HTS) material. Our group utilizes this method to produce high-quality single-crystal HTS films with atomically smooth surfaces and interfaces. In addition, ALL-MBE enables us to engineer multilayer heterostructures with atomic precision. This allows the fabrication of tunnel junctions, various nanostructures, and other HTS devices of interest for superconducting electronics. We have synthesized over three thousand LSCO thin films in the past two decades. These films’ structural and electronic properties have been studied and characterized by various methods. Here, we distill the extensive experience we accumulated into a step-by-step protocol to fabricate atomically perfect LSCO films. The recipe includes substrate preparation, ozone generation and distillation, source calibration, the in situ monitoring of the film synthesis, post-growth annealing, and ex situ characterization. It discloses a reproducible way to fabricate single-crystal LSCO films for basic research and HTS electronic applications.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation

Grant/Contract Number:: SC0012704; GBMF9074

OSTI ID:: 1922462

Report Number(s):: BNL-223915-2023-JAAM; TRN: US2312298

Journal Information:: Condensed Matter, Vol. 8, Issue 1; ISSN 2410-3896

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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SUPERCONDUCTIVITY AND SUPERFLUIDITY
superconductivity
cuprates
thin film synthesis

Title: Optimization of La2–xSrxCuO4 Single Crystal Film Growth via Molecular Beam Epitaxy

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Title: Optimization of La_2–xSr_xCuO₄ Single Crystal Film Growth via Molecular Beam Epitaxy