Spin-fluctuation glue disfavors high-critical temperature of superconductivity?

Abstract

Antiferromagnetic fluctuations are believed to be a promising glue to drive high-temperature superconductivity especially in cuprates. Here, we perform a close inspection of the superconducting mechanism from spin fluctuations in the Eliashberg framework by employing a typical one-band model on a square lattice. While spin fluctuations can eventually drive superconductivity as is well established, we find that the superconducting tendency is suppressed substantially by a seemingly negligible contribution from a small momentum transfer far away from (pi,pi). This suppression comes from phase frustration of the pairing gap and is expected to be a general feature due to the repulsive pairing interaction of spin fluctuations. Furthermore, we find that the momentum dependence of the pairing gap largely deviates from the functional form of cos kx - cos ky, although this form is well established in cuprate superconductors. We argue that an instantaneous magnetic interaction plays the important role to understand high-critical temperature of superconductivity as well as the momentum dependence of the pairing gap.

28 pages, 11 figures

References in corpus (10)

• Eliashberg Theory: a short review
• Pseudogap, Superconducting Gap, and Fermi Arc in High-Tc Cuprates Revealed by Angle-Resolved Photoemission Spectroscopy
• Renormalized mean-field analysis of antiferromagnetism and d-wave superconductivity in the two-dimensional Hubbard model
• On the Electron Pairing Mechanism of Copper-Oxide High Temperature Superconductivity
• Mechanism of Superconductivity in the Hubbard Model at Intermediate Interaction Strength
• Orbital fluctuation mechanism for superconductivity in iron-based compounds
• Quantifying the role of antiferromagnetic fluctuations in the superconductivity of the doped Hubbard model
• Structure of the pairing gap from orbital nematic fluctuations
• Renormalization of the electron-spin-fluctuation interaction in the t-t'-U Hubbard model
• Suppression of superconductivity by spin fluctuations in iron-based superconductors

Cited by in corpus (4)

• Altermagnetic polarons: the fate of alter magnetic band splittings at strong coupling
• Condensation mechanism of high-$T_c$ cuprates: the key role of pairon excitations
• Beyond on-site Hubbard interaction in charge dynamics of cuprate superconductors
• Theoretical perspectives on charge dynamics in high-temperature cuprate superconductors