Metallic conduction and superconductivity in the pseudogap phase

Details Metallic conduction and superconductivity in the pseudogap phase Metallic conduction and superconductivity in the pseudogap phase

2007-01-12

arxiv.org/abs/cond-mat/0701288v3

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages 5 Postscript figures

Scientific paper

10.1103/PhysRevB.77.052505

We analyze the t-J model on a square lattice using bosonic spinons and fermionic holons for low density x of holes. Spinons are paired into singlets, which condense below a temperature T*. The condensate evolves out of the Mott phase - preserving its symmetry. For T > T* holons and spinons are confined (by gauge forces), so that there is no coherent charge propagation. Metallic conduction and d-wave superconductivity result from separate, sublattice-preserving, holon hopping processes which originate below T* from a coupling with the condensate. A simple effective Hamiltonian describing these processes is derived and solved. Holons form a charge Fermi liquid, becoming incoherent (confined) above T*. In the superconductor holons hop as pairs, reducing kinetic energy. The two-sublattice property is the glue that connects the three phases; its effect can be seen in various correlation functions. The theory can account for many features of the cuprate superconductors, including the origin of two-dimensional metallicity.

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