Unconventional superconducting pairing by conventional phonons

Abstract

The common wisdom that the phonon mechanism of electron pairing in the weak-coupling Bardeen-Cooper-Schrieffer (BCS) superconductors leads to conventional s-wave Cooper pairs is revised. An inevitable anisotropy of sound velocity in crystals makes the phonon-mediated attraction of electrons non-local in space providing unconventional Cooper pairs with a nonzero orbital momentum in a wide range of electron densities. As a result of this anisotropy quasi-two dimensional charge carriers undergo a quantum phase transition from an unconventional d-wave superconducting state to a conventional s-wave superconductor with more carriers per unit cell. In the opposite strong-coupling regime rotational symmetry breaking appears as a result of a reduced Coulomb repulsion between unconventional bipolarons dismissing thereby some constraints on unconventional pairing in the Bose-Einstein condensation (BEC) limit. The conventional phonons, and not superexchange, are shown to be responsible for the d-wave symmetry of cuprate superconductors, where the on-site Coulomb repulsion is large.

4 pages, 4 figures, more references added

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Cited by in corpus (27)

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• Competing d${}_{xy}$ and s${}_{\pm }$ Pairing Symmetries in Superconducting La${}_3$Ni${}_2$O${}_7$ emerge from LDA+FLEX Calculations
• Turning a Band Insulator Into an Exotic Superconductor
• Polaronic properties of an impurity in a Bose-Einstein condensate in reduced dimensions
• Bipolarons and multi-polarons consisting of impurity atoms in a Bose-Einstein condensate
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• Unconventional high-temperature superconductivity from repulsive interactions: theoretical constraints
• Bipolaron in the t-J model coupled to longitudinal and transverse quantum lattice vibrations
• High Temperature Superconductivity: the explanation
• Lattice polarons across the superfluid to Mott insulator transition
• Evidence for singular-phonon-induced nematic superconductivity in a topological superconductor candidate Sr${}_{0.1}$Bi${}_2$Se${}_3$
• Key pairing interaction in layered doped ionic insulators
• Pairing mechanism of high-temperature superconductivity: Experimental constraints
• Theory of High Temperature Superconductivity in Doped Polar Insulator
• Response of the polaron system consisting of an impurity in a Bose-Einstein condensate to Bragg spectroscopy
• Mobile impurities interacting with a few one-dimensional lattice bosons
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• Universal Non-Landau, Self-Organized, Lattice Disordering Percolative Dopant Network Sub-Tc Phase Transitions in Ceramic Superconductors
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• Topological Theory of Ceramic High Temperature Superconductors
• Calculated Unconventional Superconductivity via Charge Fluctuations in Kagome Metal CsV3Sb5
• Calculated Spin Fluctuational Pairing Interaction in HgBa2CuO4 using LDA+FLEX Method
• Calculations of Spin Fluctuation Spectral Functions ${\alpha }^{2}F$ in High-Temperature Superconducting Cuprates
• Weakly Anisotropic Noncentrosymmetric Superconductors with Radial Line Nodes and Thermodynamical Anomalies
• Resolving phonon-mediated superconducting pairing symmetries from first-principles calculation