Affiliation:
1. Institute for superconductors, oxides and other innovative materials and devices
2. Stockholm University
3. Sapienza University of Rome
Abstract
We argue that there is a special doping point in the phase diagram of cuprates, such that the condensation of holes into a charge-ordered and a superconducting phase are degenerate in energy but with an energy barrier in between. We present Monte Carlo simulations of a phenomenological XXZ model for this problem without and with quenched disorder in two dimensions. While in the clean case charge order and superconductivity are separated by a first-order line which is nearly independent of temperature, in the presence of quenched disorder charge order is fragmented into domains separated by superconducting filaments reminiscent of the supersolid behaviour in ^44He. Assuming weak interlayer couplings, the resulting phase diagram of the three-dimensional system is in good agreement with the experiments.
Funder
Agence Nationale de la Recherche
Carl Tryggers Stiftelse för Vetenskaplig Forskning
Consejo Nacional de Investigaciones Cientificas y Tecnicas
Ministero dell'Università e della Ricerca
Ministero dell’Istruzione, dell’Università e della Ricerca
National Science Foundation
Sapienza Università di Roma
Subject
General Physics and Astronomy