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Heterostructuring as Gateway to Electron Doping of Nickelate Superconductors

Chao Deng1, Motoharu Kitatani2,3, Guiwen Jiang4, Siqi Guo1, Niklas Witt5, Ao Zhang1,6, Wenfeng Wu7,8,9, Mi Jiang4, Karsten Held9 et al.

Liang Si1,10,11,9,*

  • 1School of Physics, Northwest University, Xi’an 710127, China
  • 2Department of Material Science, University of Hyogo, Ako, Hyogo 678-1297, Japan
  • 3Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
  • 4School of Physical Science and Technology, Soochow University, Suzhou 215006, China
  • 5Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ctd.qmat, Universität Würzburg, 97074 Würzburg, Germany
  • 6Department of Physics, Southeast University, Nanjing 211189, China
  • 7Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
  • 8Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
  • 9Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
  • 10Shaanxi Key Laboratory for Theoretical Physics Frontiers, Xi’an 710127, China
  • 11Fundamental Discipline Research Center for Quantum Science and technology of Shaanxi Province, Xi’an 710127, China

  • *Contact author: siliang@nwu.edu.cn
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Phys. Rev. Lett. 137, 086004 – Published 20 August, 2026

DOI: https://doi.org/10.1103/qp4p-x6g3

Abstract

Despite enormous expenditures in the research field, the electron-doped side of nickelate superconductors remains uncharted territory. Substituting the trivalent rare-earth cations by a tetravalent one hitherto failed. Here, we demonstrate by first-principles calculations a disorder-free route to electron dope Ruddlesden-Popper nickelates. When intercalating wide-band-gap insulating layers such as LaXO3 (X=Al, Ga, Sc) into La2NiO4, the extra (LaO)+ layers act as electron donors, releasing carriers into the Ni-3d orbitals. This electron doping puts La2NiO4:La2AlO4 naturally in the optimal region for dx2−y2-wave superconductivity with Tc exceeding 50 K. The same concept also allows us to electron dope La3Ni2O7, the superconductor in the limelight.

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Phys. Rev. Lett. 137, 086004– Published 20 August, 2026
  • Received 26 January 2026
  • Accepted 23 June 2026
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