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Gapless Chiral Superconducting (d + id)-Wave Phase in Strongly Correlated Layered Material with a Triangular Lattice

  • ORDER, DISORDER, AND PHASE TRANSITION IN CONDENSED SYSTEM
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Abstract

It is shown that interlayer electron tunneling in the quasi-two-dimensional ensemble of Hubbard fermions leads to the realization of the gapless superconducting phase with the chiral (d + id)-wave order parameter symmetry, not for a single value of sodium ion concentration, but in a wide range of concentrations. Precisely this situation corresponds to experimental data on the layered sodium cobaltite intercalated by water (NaxCoO2 ⋅ yH2O). Intra-atomic electron repulsion that determines the strong electron correlation regime leads to the representation of Hubbard fermions, the interaction of which ensures Cooper instability. Intersite intralayer interactions between fermions considerably affect the positions of nodal points of the chiral order parameter and change the critical concentration at which a topological transition occurs in the 2D system of Hubbard fermions.

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Funding

This study was supported by the Russian Foundation for Basic Research (project nos. 19-02-00348 and 18-42-240014), the Administration of the Krasnoyarsk Kray, the Krasnoyarsk Kray Science Foundation within research project “Single-orbital Effective Model of Ensemble of Spin-Polaron Quasiparticles in the Problem of Description of the Intermediate State and Pseudogap Behavior of Cuprate Superconductors” (project no. 18-42-240014).

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Authors and Affiliations

  1. Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center,” Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

    V. V. Val’kov & V. A. Mitskan

  2. Siberian Federal University, 660041, Krasnoyarsk, Russia

    T. A. Val’kova

  3. Reshetnev Siberian State University of Science and Technology, 660037, Krasnoyarsk, Russia

    V. A. Mitskan

Authors
  1. V. V. Val’kov
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  2. T. A. Val’kova
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  3. V. A. Mitskan
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Correspondence to V. V. Val’kov.

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Translated by N. Wadhwa

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Val’kov, V.V., Val’kova, T.A. & Mitskan, V.A. Gapless Chiral Superconducting (d + id)-Wave Phase in Strongly Correlated Layered Material with a Triangular Lattice. J. Exp. Theor. Phys. 130, 235–246 (2020). https://doi.org/10.1134/S1063776120010197

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  • DOI: https://doi.org/10.1134/S1063776120010197

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