Volume 90, Number 2, April 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||06 May 2010|
Superconductivity close to the charge-density-wave instability
Regroupement Québécois sur le Matériaux de Pointe, Département de Physique, Université de Sherbrooke Sherbrooke, Québec, Canada, J1K-2R1
2 Canadian Insitute for Advanced Research - Toronto, Ontario, Canada
Corresponding author: email@example.com
Accepted: 6 April 2010
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 ωD. We single out a power law increase of the superconducting Tc ~ ωD0.7 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.
PACS: 74.20.Mn – Nonconventional mechanisms / 71.45.Lr – Charge-density-wave systems / 74.70.Kn – Organic superconductors
© EPLA, 2010
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