Superconductivity close to the charge-density-wave instability

Details Superconductivity close to the charge-density-wave instability Superconductivity close to the charge-density-wave instability

2010-01-16

arxiv.org/abs/1001.2839v1

EPL, 90, 27001 (2010)

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures

Scientific paper

10.1209/0295-5075/90/27001

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.

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