Superconductivity without attraction in a quasi-one-dimensional metal
Abstract
An array of one-dimensional conductors coupled by transverse hopping and interaction is studied with the help of a variational wave function. This wave function is devised as to account for one-dimensional correlation effects. We show that under broad conditions our system possesses the superconducting ground state even if no attraction is present. The superconducting mechanism is of many-body nature and deviates substantially from BCS. The phase diagram of the model is mapped. It consists of two ordered phases competing against each other: density wave, spin or charge, and unconventional superconductivity. These phases are separated by the first order transition. The symmetry of the superconducting order parameter is a non-universal property. It depends on particulars of the Hamiltonian. Within the framework of our model possible choices are the triplet -wave and the singlet -wave. Organic quasi-one-dimensional superconductors have similar phase diagram.
Cite
@article{arxiv.0708.1884,
title = {Superconductivity without attraction in a quasi-one-dimensional metal},
author = {A. V. Rozhkov},
journal= {arXiv preprint arXiv:0708.1884},
year = {2010}
}
Comments
12 pages, 2 Encapsulated PostScript figures, revtex4; the model's Hamiltonian is revised as compared to previous version, this revision affects prediction of the order parameter symmetry