-wave superconductivity and its coexistence with antiferromagnetism in the model: Statistically consistent Gutzwiller approach

M Abram, J Kaczmarczyk, J Jędrak, J Spałek - Physical Review B—Condensed …, 2013 - APS
Physical Review B—Condensed Matter and Materials Physics, 2013APS
We discuss the coexistence of antiferromagnetism and d-wave superconductivity within the
so-called statistically consistent Gutzwiller approximation (SGA) applied to the t–J–U model.
In this approach, the averages calculated in a self-consistent manner coincide with those
determined variationally. Such consistency is not guaranteed within the standard
renormalized mean-field theory. With the help of SGA, we show that for the typical value J/|
t|= 1 3, coexistence of antiferromagnetism (AF) and superconductivity (SC) appears only for …
We discuss the coexistence of antiferromagnetism and -wave superconductivity within the so-called statistically consistent Gutzwiller approximation (SGA) applied to the model. In this approach, the averages calculated in a self-consistent manner coincide with those determined variationally. Such consistency is not guaranteed within the standard renormalized mean-field theory. With the help of SGA, we show that for the typical value , coexistence of antiferromagnetism (AF) and superconductivity (SC) appears only for and in a very narrow range of doping in the vicinity of the Mott insulating state, in contrast to some previous reports. In the coexistent AF+SC phase, a staggered spin-triplet component of the superconducting gap appears also naturally; its value is very small.
American Physical Society
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