Abstract
The discovery of unconventional superconductivity in (La,Ba)2CuO4 (ref. 1) 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 (ref. 2) and surface-electron-doped Sr2IrO4, which exhibits spectroscopic signatures consistent with a superconducting gap3,4, although a zero-resistance state has not yet been observed. This approach has also led to the theoretical investigation of nickelates5,6, as well as thin-film heterostructures designed to host superconductivity. One such structure is the LaAlO3/LaNiO3 superlattice7,8,9, 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 orbitals10. Here we report the observation of superconductivity in an infinite-layer nickelate that is isostructural to infinite-layer copper oxides11,12,13. Using soft-chemistry topotactic reduction14,15,16,17,18,19,20, 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 structures21,22,23, these results suggest the possibility of a family of nickelate superconductors analogous to copper oxides24 and pnictides25.
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The data presented in the figures and other findings of this study are available from the corresponding authors upon reasonable request.
References
Bednorz, J. G. & Müller, K. A. Possible high T c superconductivity in the Ba-La-Cu-O system. Z. Phys. B 64, 189–193 (1986).
Maeno, Y. et al. Superconductivity in a layered perovskite without copper. Nature 372, 532–534 (1994).
Yan, Y. J. et al. Electron-doped Sr2IrO4: an analogue of hole-doped cuprate superconductors demonstrated by scanning tunneling microscopy. Phys. Rev. X 5, 041018 (2015).
Kim, Y. K., Sung, N. H., Denlinger, J. D. & Kim, B. J. Observation of a d-wave gap in electron-doped Sr2IrO4. Nat. Phys. 12, 37–41 (2016).
Anisimov, V. I., Bukhvalov, D. & Rice, T. M. Electronic structure of possible nickelate analogs to the cuprates. Phys. Rev. B 59, 7901–7906 (1999).
Lee, K.-W. & Pickett, W. E. Infinite-layer LaNiO2: Ni1+ is not Cu2+. Phys. Rev. B 70, 165109 (2004).
Chaloupka, J. & Khaliullin, G. Orbital order and possible superconductivity in LaNiO3/LaMO3 superlattices. Phys. Rev. Lett. 100, 016404 (2008).
Hansmann, P. et al. Turning a nickelate Fermi surface into a cuprate-like one through heterostructuring. Phys. Rev. Lett. 103, 016401 (2009).
Han, M. J., Wang, X., Marianetti, C. A. & Millis, A. J. Dynamical mean-field theory of nickelate superlattices. Phys. Rev. Lett. 107, 206804 (2011); erratum 110, 179904 (2013).
Disa, A. S. et al. Orbital engineering in symmetry-breaking polar heterostructures. Phys. Rev. Lett. 114, 026801 (2015).
Siegrist, T., Zahurak, S. M., Murphy, D. W. & Roth, R. S. The parent structure of the layered high-temperature superconductors. Nature 334, 231–232 (1988).
Smith, M. G., Manthiram, A., Zhou, J., Goodenough, J. B. & Markert, J. T. Electron-doped superconductivity at 40 K in the infinite-layer compound Sr1−yNdyCuO2. Nature 351, 549–551 (1991).
Azuma, M., Hiroi, Z., Takano, M., Bando, Y. & Takeda, Y. Superconductivity at 110 K in the infinite-layer compound (Sr1−xCax)1−yCuO2. Nature 356, 775–776 (1992).
Crespin, M., Levitz, P. & Gatineau, L. Reduced forms of LaNiO3 perovskite. Part 1.—Evidence for new phases: La2Ni2O5 and LaNiO2. J. Chem. Soc. Faraday Trans. II 79, 1181–1194 (1983).
Hayward, M. A., Green, M. A., Rosseinsky, M. J. & Sloan, J. Sodium hydride as a powerful reducing agent for topotactic oxide deintercalation: synthesis and characterization of the nickel(I) oxide LaNiO2. J. Am. Chem. Soc. 121, 8843–8854 (1999).
Hayward, M. A. & Rosseinsky, M. J. Synthesis of the infinite layer Ni(I) phase NdNiO2+x by low temperature reduction of NdNiO3 with sodium hydride. Solid State Sci. 5, 839–850 (2003).
Kawai, M. et al. Reversible changes of epitaxial thin films from perovskite LaNiO3 to infinite-layer structure LaNiO2. Appl. Phys. Lett. 94, 082102 (2009).
Kaneko, D., Yamagishi, K., Tsukada, A., Manabe, T. & Naito, M. Synthesis of infinite-layer LaNiO2 films by metal organic decomposition. Physica C 469, 936–939 (2009).
Ikeda, A., Krockenberger, Y., Irie, H., Naito, M. & Yamamoto, H. Direct observation of infinite NiO2 planes in LaNiO2 films. Appl. Phys. Express 9, 061101 (2016).
Onozuka, T., Chikamatsu, A., Katayama, T., Fukumura, T. & Hasegawa, T. Formation of defect-fluorite structured NdNiOxHy epitaxial thin films via a soft chemical route from NdNiO3 precursors. Dalton Trans. 45, 12114–12118 (2016).
Lacorre, P. Passage from T-type to T′-type arrangement by reducing R 4Ni3O10 to R 4Ni3O8 (R = La, Pr, Nd). J. Solid State Chem. 97, 495–500 (1992).
Poltavets, V. V. et al. La3Ni2O6: a new double T′-type nickelate with infinite Ni1+/2+O2 layers. J. Am. Chem. Soc. 128, 9050–9051 (2006).
Zhang, J. et al. Large orbital polarization in a metallic square-planar nickelate. Nat. Phys. 13, 864–869 (2017).
Keimer, B., Kivelson, S. A., Norman, M. R., Uchida, S. & Zaanen, J. From quantum matter to high-temperature superconductivity in copper oxides. Nature 518, 179–186 (2015).
Hosono, H. & Kuroki, K. Iron-based superconductors: current status of materials and pairing mechanism. Physica C 514, 399–422 (2015).
Cheong, S.-W., Hwang, H. Y., Batlogg, B., Cooper, A. S. & Canfield, P. C. Electron-hole doping of the metal-insulator transition compound RENiO3. Physica B 194–196, 1087–1088 (1994).
García-Muñoz, J. L., Suaaidi, M., Martínez-Lope, M. J. & Alonso, J. A. Influence of carrier injection on the metal-insulator transition in electron- and hole-doped R 1−x A xNiO3 perovskite. Phys. Rev. B 52, 13563–13569 (1995).
Torrance, J. B., Lacorre, P., Nazzal, A. I., Ansaldo, E. J. & Niedermayer, C. Systematic study of insulator-metal transitions in perovskites RNiO3 (R=Pr, Nd, Sm, Eu) due to closing of charge-transfer gap. Phys. Rev. B 45, 8209–8212 (1992).
Kawai, M. et al. Orientation change of an infinite-layer structure LaNiO2 epitaxial thin film by annealing with CaH2. Cryst. Growth Des. 10, 2044–2046 (2010).
Nakagawa, N., Hwang, H. Y. & Muller, D. A. Why some interfaces cannot be sharp. Nat. Mater. 5, 204–209 (2006).
Fruchter, L. et al. Penetration depth of electron-doped infinite-layer Sr0.88La0.12CuO2+x thin films. Phys. Rev. B 82, 144529 (2010).
He, X., Gozar, A., Sundling, R. & Božović, I. High-precision measurement of magnetic penetration depth in superconducting films. Rev. Sci. Instrum. 87, 113903 (2016).
Zhang, F. C. & Rice, T. M. Effective Hamiltonian for the superconducting Cu oxides. Phys. Rev. B 37, 3759–3761 (1988).
Acknowledgements
We thank A. Kapitulnik, S. A. Kivelson, W.-S. Lee, Y. Z. Li, S. Raghu and Z. X. Shen for discussions. This work was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under contract number DE-AC02-76SF00515. D.L. acknowledges partial support by the Swiss National Science Foundation, and the Gordon and Betty Moore Foundation’s Emergent Phenomena in Quantum Systems Initiative through grant number GBMF4415, which also supported S.C. and provided synthesis equipment. M.O. acknowledges partial financial support from the Takenaka Scholarship Foundation.
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D.L., Y.H. and H.Y.H. conceived the project. D.L. and M.O. grew the nickelate films and conducted the reduction experiments. K.L., D.L., M.O., H.R.L. and Y.C. conducted materials and structural characterization. B.Y.W., S.C. and D.L. performed the transport and mutual-inductance measurements. D.L. and H.Y.H. wrote the manuscript with contribution from all authors.
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Li, D., Lee, K., Wang, B.Y. et al. Superconductivity in an infinite-layer nickelate. Nature 572, 624–627 (2019). https://doi.org/10.1038/s41586-019-1496-5
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DOI: https://doi.org/10.1038/s41586-019-1496-5
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