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Title: Aspects of the synthesis of thin film superconducting infinite-layer nickelates

Abstract

The recent observation of superconductivity in Nd0.8Sr0.2NiO2 calls for further investigation and optimization of the synthesis of this infinite-layer nickelate structure. Here, we present our current understanding of important aspects of the growth of the parent perovskite compound via pulsed laser deposition on SrTiO3 (001) substrates and the subsequent topotactic reduction. We find that to achieve single-crystalline, single-phase superconducting Nd0.8Sr0.2NiO2, it is essential that the precursor perovskite Nd0.8Sr0.2NiO3 thin film is stabilized with no visible impurity phases; in particular, a Ruddlesden–Popper-type secondary phase is often observed. We have further investigated the evolution of the soft-chemistry topotactic reduction conditions to realize full transformation to the infinite-layer structure with no film decomposition or formation of other phases. We find that capping the nickelate film with a subsequent SrTiO3 layer provides an epitaxial template to the top region of the nickelate film, much like the substrate. Thus, for currently optimized growth conditions, we can stabilize superconducting single-phase Nd0.8Sr0.2NiO2 (001) epitaxial thin films up to ~10 nm.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Science (SIMES); Stanford Univ., CA (United States)
  2. Cornell Univ., Ithaca, NY (United States)
  3. Cornell Univ., Ithaca, NY (United States); Kavli Inst. at Cornell for Nanoscale Science, Ithaca, NY (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Swiss National Science Foundation (SNF); Gordon and Betty Moore Foundation; US Air Force Office of Scientific Research (AFOSR); Packard Foundation; National Science Foundation (NSF); Weill Institute; Kavli Institute at Cornell; USDOE
OSTI Identifier:
1614861
Alternate Identifier(s):
OSTI ID: 1632934
Grant/Contract Number:  
AC02-76SF00515; P2GEP2_168277; GBMF4415; FA 9550-16-1-0305; DMR-1539918; DMR-1719875; NSF-MRI-1429155
Resource Type:
Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 8; Journal Issue: 4; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Pulsed laser deposition; Thin film growth; Superconductivity; Perovskites

Citation Formats

Lee, Kyuho, Goodge, Berit H., Li, Danfeng, Osada, Motoki, Wang, Bai Yang, Cui, Yi, Kourkoutis, Lena F., and Hwang, Harold Y. Aspects of the synthesis of thin film superconducting infinite-layer nickelates. United States: N. p., 2020. Web. doi:10.1063/5.0005103.
Lee, Kyuho, Goodge, Berit H., Li, Danfeng, Osada, Motoki, Wang, Bai Yang, Cui, Yi, Kourkoutis, Lena F., & Hwang, Harold Y. Aspects of the synthesis of thin film superconducting infinite-layer nickelates. United States. doi:https://doi.org/10.1063/5.0005103
Lee, Kyuho, Goodge, Berit H., Li, Danfeng, Osada, Motoki, Wang, Bai Yang, Cui, Yi, Kourkoutis, Lena F., and Hwang, Harold Y. Thu . "Aspects of the synthesis of thin film superconducting infinite-layer nickelates". United States. doi:https://doi.org/10.1063/5.0005103. https://www.osti.gov/servlets/purl/1614861.
@article{osti_1614861,
title = {Aspects of the synthesis of thin film superconducting infinite-layer nickelates},
author = {Lee, Kyuho and Goodge, Berit H. and Li, Danfeng and Osada, Motoki and Wang, Bai Yang and Cui, Yi and Kourkoutis, Lena F. and Hwang, Harold Y.},
abstractNote = {The recent observation of superconductivity in Nd0.8Sr0.2NiO2 calls for further investigation and optimization of the synthesis of this infinite-layer nickelate structure. Here, we present our current understanding of important aspects of the growth of the parent perovskite compound via pulsed laser deposition on SrTiO3 (001) substrates and the subsequent topotactic reduction. We find that to achieve single-crystalline, single-phase superconducting Nd0.8Sr0.2NiO2, it is essential that the precursor perovskite Nd0.8Sr0.2NiO3 thin film is stabilized with no visible impurity phases; in particular, a Ruddlesden–Popper-type secondary phase is often observed. We have further investigated the evolution of the soft-chemistry topotactic reduction conditions to realize full transformation to the infinite-layer structure with no film decomposition or formation of other phases. We find that capping the nickelate film with a subsequent SrTiO3 layer provides an epitaxial template to the top region of the nickelate film, much like the substrate. Thus, for currently optimized growth conditions, we can stabilize superconducting single-phase Nd0.8Sr0.2NiO2 (001) epitaxial thin films up to ~10 nm.},
doi = {10.1063/5.0005103},
journal = {APL Materials},
number = 4,
volume = 8,
place = {United States},
year = {2020},
month = {4}
}

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