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Hund-Heisenberg model in superconducting infinite-layer nickelates

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Abstract

We theoretically investigate the unconventional superconductivity in the newly discovered infinite-layer nickelates Nd1−xSrxNiO2 based on a two-band model. By analyzing the transport experiments, we propose that the doped holes dominantly enter the Ni dxy or/and d3z2−r2 orbitals as charged carriers, and form a conducting band. Via the onsite Hund coupling, the doped holes are coupled to the Ni localized holes in the dx2−y2 orbital band. We demonstrate that this two-band model could be further reduced to a Hund-Heisenberg model. Using the reduced model, we show the non-Fermi liquid state above the critical Tc could stem from the carriers coupled to the spin fluctuations of the localized holes. In the superconducting phase, the short-range spin fluctuations mediate the carriers into Cooper pairs and establish dx2−y2-wave superconductivity. We further predict that the doped holes ferromagnetically coupled with the local magnetic moments remain itinerant even at very low temperature, and thus the pseudogap hardly emerges in nickelates. Our work provides a new superconductivity mechanism for strongly correlated multi-orbital systems and paves a distinct way to exploring new superconductors in transition or rare-earth metal oxides.

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Authors and Affiliations

  1. College of Physics and Information Technology, Shaanxi Normal University, Xi’an, 710119, P.R. China

    Jun Chang

  2. School of Physical Science and Technology & Key Laboratory for Magnetism and Magnetic Materials of the MoE, Lanzhou University, Lanzhou, 730000, P.R. China

    Jize Zhao

  3. Center for High-Pressure Science and Technology Advanced Research, Beijing, 100094, P.R. China

    Yang Ding

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  1. Jun Chang
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Chang, J., Zhao, J. & Ding, Y. Hund-Heisenberg model in superconducting infinite-layer nickelates. Eur. Phys. J. B 93, 220 (2020). https://doi.org/10.1140/epjb/e2020-10343-7

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