On the Liaison Between Superconductivity and Phase Separation

Abstract

Models of strongly correlated electrons that tend to phase separate are studied including a long-range 1/r repulsive interaction. It is observed that charge-density-wave states become stable as the strength of the 1/r term, ${\mathrm{V}}_{\mathrm{coul}}$, is increased. Due to this effect, the domain of stability of the superconducting phases that appear near phase separation at ${\mathrm{V}}_{\mathrm{coul}}=0$ is not enlarged by a 1/r interaction as naively expected. Nevertheless, superconductivity exists in a wide region of parameter space, even if phase separation is suppressed. Our results have implications for some theories of the cuprates.

11 pages, 9 postscript figures are appended

References in corpus (7)

• Correlated Electrons in High Temperature Superconductors
• Indications of d_{x^2 - y^2} Superconductivity in the Two Dimensional t-J Model
• Superconductivity Near Phase Separation in Models of Correlated Electrons
• On the Possibility of New High Tc Superconductors by Producing metal Heterostructures as in the Cuprate Perovskites
• Bogoliubov Quasiparticle Excitations in the Two-Dimensional t-J Model
• Spin Gap and Superconductivity in the One-Dimensional t-J Model with Coulomb Repulsion
• Superconductivity in the Cuo Hubbard Model with Long-Range Coulomb Repulsion

Cited by in corpus (13)

• Correlated Electrons in High Temperature Superconductors
• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• Phase Separation in Electronic Models for Manganites
• A Survey of the Van Hove Scenario for High-T_c Superconductivity With Special Emphasis on Pseudogaps and Striped Phases
• Doped planar quantum antiferromagnets with striped phases
• Antiferromagnetism and hole pair checkerboard in the vortex state of high Tc superconductors
• Charge ordering and long-range interactions in layered transition metal oxides
• Influence of Nearest-Neighbor Coulomb Interactions on the Phase Diagram of the Ferromagnetic Kondo Model
• Revisiting two holes in a locally antiferromagnetic background: the role of retardation and Coulomb repulsion effects
• Global Phase Diagram of the High Tc Cuprates
• Low energy collective modes, Ginzburg-Landau theory, and pseudogap behavior in superconductors with long-range pairing interactions
• Superconductivity from correlated hopping
• Nanoscale phase separation and superconductivity in the one-dimensional Hirsch model