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Superconductivity in an infinite-layer nickelate
Abstract
The discovery of unconventional superconductivity in (La,Ba) 2CuO 4 has motivated the study of compounds with similar crystal and electronic structure, with the aim of finding additional superconductors and understanding the origins of copper oxide superconductivity. Isostructural examples include bulk superconducting Sr 2RuO 4 and surface-electron-doped Sr 2IrO 4, which exhibits spectroscopic signatures consistent with a superconducting gap, although a zero-resistance state has not yet been observed. This method has additionally led to the theoretical investigation of nickelates, as well as thin-film heterostructures designed to host superconductivity. One such structure is the LaAlO 3/LaNiO 3 superlattice, which has been recently proposed for the creation of an artificially layered nickelate heterostructure with a singly occupied d$$_{x^{2}−y^{2}}$$ band. The absence of superconductivity observed in previous related experiments has been attributed, at least in part, to incomplete polarization of the e g orbitals. In this work we report the observation of superconductivity in an infinite-layer nickelate that is isostructural to infinite-layer copper oxides. Using soft-chemistry topotactic reduction, NdNiO 2 and Nd 0.8Sr 0.2NiO 2 single-crystal thin films are synthesized by reducing the perovskite precursor phase. Whereas NdNiO 2 exhibits a resistive upturn at low temperature, measurements of the resistivity, critical current density and magnetic-field response of Nd 0.8Sr 0.2NiO 2 indicate a superconducting transition temperature of about 9 to 15 kelvin. Because this compound is a member of a series of reduced layered nickelate crystal structures, these results suggest the possibility of a family of nickelate superconductors analogous to copper oxides and pnictides.
- Authors:
-
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Swiss National Science Foundation (SNSF)
- OSTI Identifier:
- 1562463
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature (London)
- Additional Journal Information:
- Journal Name: Nature (London); Journal Volume: 572; Journal Issue: 7771; Journal ID: ISSN 0028-0836
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Li, Danfeng, Lee, Kyuho, Wang, Bai Yang, Osada, Motoki, Crossley, Samuel, Lee, Hye Ryoung, Cui, Yi, Hikita, Yasuyuki, and Hwang, Harold Y. Superconductivity in an infinite-layer nickelate. United States: N. p., 2019.
Web. doi:10.1038/s41586-019-1496-5.
Li, Danfeng, Lee, Kyuho, Wang, Bai Yang, Osada, Motoki, Crossley, Samuel, Lee, Hye Ryoung, Cui, Yi, Hikita, Yasuyuki, & Hwang, Harold Y. Superconductivity in an infinite-layer nickelate. United States. doi:10.1038/s41586-019-1496-5.
Li, Danfeng, Lee, Kyuho, Wang, Bai Yang, Osada, Motoki, Crossley, Samuel, Lee, Hye Ryoung, Cui, Yi, Hikita, Yasuyuki, and Hwang, Harold Y. Wed .
"Superconductivity in an infinite-layer nickelate". United States. doi:10.1038/s41586-019-1496-5.
@article{osti_1562463,
title = {Superconductivity in an infinite-layer nickelate},
author = {Li, Danfeng and Lee, Kyuho and Wang, Bai Yang and Osada, Motoki and Crossley, Samuel and Lee, Hye Ryoung and Cui, Yi and Hikita, Yasuyuki and Hwang, Harold Y.},
abstractNote = {The discovery of unconventional superconductivity in (La,Ba)2CuO4 has motivated the study of compounds with similar crystal and electronic structure, with the aim of finding additional superconductors and understanding the origins of copper oxide superconductivity. Isostructural examples include bulk superconducting Sr2RuO4 and surface-electron-doped Sr2IrO4, which exhibits spectroscopic signatures consistent with a superconducting gap, although a zero-resistance state has not yet been observed. This method has additionally led to the theoretical investigation of nickelates, as well as thin-film heterostructures designed to host superconductivity. One such structure is the LaAlO3/LaNiO3 superlattice, which has been recently proposed for the creation of an artificially layered nickelate heterostructure with a singly occupied d$_{x^{2}−y^{2}}$ band. The absence of superconductivity observed in previous related experiments has been attributed, at least in part, to incomplete polarization of the eg orbitals. In this work we report the observation of superconductivity in an infinite-layer nickelate that is isostructural to infinite-layer copper oxides. Using soft-chemistry topotactic reduction, NdNiO2 and Nd0.8Sr0.2NiO2 single-crystal thin films are synthesized by reducing the perovskite precursor phase. Whereas NdNiO2 exhibits a resistive upturn at low temperature, measurements of the resistivity, critical current density and magnetic-field response of Nd0.8Sr0.2NiO2 indicate a superconducting transition temperature of about 9 to 15 kelvin. Because this compound is a member of a series of reduced layered nickelate crystal structures, these results suggest the possibility of a family of nickelate superconductors analogous to copper oxides and pnictides.},
doi = {10.1038/s41586-019-1496-5},
journal = {Nature (London)},
number = 7771,
volume = 572,
place = {United States},
year = {2019},
month = {8}
}
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