Superconductivity close to the charge-density-wave instability

Abstract

We use the weak coupling renormalization group method to examine the interplay between charge-density-wave and s-wave superconducting orders in a quasi-one-dimensional model of electrons interacting with acoustic phonons. The relative stability of both types of order is mapped out at arbitrary nesting deviations and Debye phonon frequency ${\omega }_D$. We singled out a power law increase of the superconducting $T_c\sim {\omega }_D^{0.7}$ from a quantum critical point of charge-density-wave order triggered by nesting alterations. The results capture the key features shown by the proximity between the two types of ordering in the phase diagram of the recently discovered Perylene based organic superconductor under pressure. The impact of Coulomb interaction on the relative stability of the competing phases is examined and discussed in connection with the occurrence of s-wave superconductivity in low dimensional charge-density-wave materials.

6 pages, 5 figures

References in corpus (5)

• Correlation between linear resistivity and $T_c$ in the Bechgaard salts and the pnictide superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Triplet superconducting pairing and density-wave instabilities in organic conductors
• Link between antiferromagnetism and superconductivity probed by nuclear spin relaxation in organic conductors
• The quantum vs classical aspects of one dimensional electron-phonon systems revisited by the renormalization group method
• Phonon-mediated tuning of instabilities in the Hubbard model at half-filling

Cited by in corpus (6)

• Functional renormalization group approach to correlated fermion systems
• Fe-doping induced superconductivity in charge-density-wave system 1T-TaS2
• Phonon dispersion and the competition between pairing and charge order
• Non-separable frequency dependence of two-particle vertex in interacting fermion systems
• Quasi one-dimensional organic conductors: from Fröhlich conductivity and Peierls insulating state to magnetically-mediated superconductivity, a retrospective
• Role of electron-phonon interaction in a magnetically driven mechanism for superconductivity