Superconducting ground states of the extended t−J model
L. G. Sarasua
DOI 10.1103/PhysRevB.75.054504 · Physical Review B
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Abstract
In this work, we study an extended version of the t−J model. For special values of the hopping parameters we obtain exactly the ground state of the model. We found that depending on the values of the system parameters, the ground state may be superconducting, a charge ordered insulator, or a phase separated state. As holes are added to the system, it may experience a transition from an insulator to a superconductor. The doping dependence of the superfluid density and the complex symmetry of the superconducting parameter are in agreement with the phenomenology of the cuprates.
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