2004/01/31 by J. M. P. Carmelo, F. Guinea, Karlo Penc +2 · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1209/epl/i2004-10273-7
7 pages, 2 figures
arxiv created 2004/05/21 · openalex publication_date 2004/11/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We present an analysis of a system of weakly coupled Hubbard chains based on combining an exact study of spectral functions of the uncoupled-chain system with a renormalization group method for the coupled chains. For low values of the onsite repulsion U and of the doping δ, the leading instability is towards a superconducting state. The process includes excited states above a small correlation pseudogap. Similar features appear in extended Hubbard models in the vicinity of commensurate fillings. Our theoretical predictions are consistent with the phase diagram observed in the (TMTTF) 2 X and (TMTSF) 2 X series of organic compounds.