Superconductivity and antiferromagnetism in NdNiO2 and CaCuO2: A cluster DMFT study

Jonathan Karp, Alexander Hampel, and Andrew J. Millis
Phys. Rev. B 105, 205131 – Published 23 May 2022

Abstract

We perform a comparative 2×2 real space cluster DMFT study on minimal models for NdNiO2 and CaCuO2 obtained from downfolding DFT states, using a Nambu formalism that allows for both superconducting and antiferromagnetic order. We produce a phase diagram in temperature and doping. We find that for the nickelate, like the cuprate, the stoichiometric compound is antiferromagnetic. We find superconductivity in a doping range bounded, with a small coexistence region, by the onset of antiferromagnetism at low doping and with transition temperature becoming immeasurably small at high doping. Superconductivity emerges at around the same hole doping for both compounds, but requires a larger deviation from half-filling for the nickelate. Both antiferromagnetic and superconducting order lead to a partial gapping of the dx2y2 Fermi surface sheet. Our similar results for the cuprate and nickelate suggest that nickelate superconductivity is cupratelike. We compare our results to the experimental phase diagram.

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  • Received 28 January 2022
  • Revised 11 May 2022
  • Accepted 12 May 2022

DOI:https://doi.org/10.1103/PhysRevB.105.205131

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jonathan Karp1,*, Alexander Hampel2, and Andrew J. Millis2,3

  • 1Department of Applied Physics and Applied Math, Columbia University, New York, New York 10027, USA
  • 2Center for Computational Quantum Physics, Flatiron Institute, 162 5th Avenue, New York, New York 10010, USA
  • 3Department of Physics, Columbia University, New York, New York 10027, USA

  • *jk3986@columbia.edu

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Issue

Vol. 105, Iss. 20 — 15 May 2022

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