Interplay of superconductivity with structural phases in a generalized t-J model

Details Interplay of superconductivity with structural phases in a generalized t-J model Interplay of superconductivity with structural phases in a generalized t-J model

2000-04-04

arxiv.org/abs/cond-mat/0004052v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, Proceed. M2S-HTSC-VI Houston

Scientific paper

The phase diagram of the t-J-V model is discussed using a 1/N expansion in terms of X operators. It is shown that a flux phase of d-wave symmetry is stabilized by the Coulomb interaction V at intermediate dopings and competes with d-wave superconductivity. Since the flux wave instability is stronger than the superconducting one optimal doping is essentially determined by the onset of the flux phase. Below optimal doping the flux phase coexists with superconductivity at low and exists as a pseudo gap phase at higher temperatures. It is also found that the flux phase boundary is much less sensitive to impurity scattering than the boundary for superconductivity in agreement with experiments in Zn doped La-214 and (Y,Ca)-123.

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