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

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTORS;    CUPRATE SUPERCONDUCTORS;    HUBBARD-MODEL;    GOSSAMER SUPERCONDUCTIVITY;    NEUTRON-SCATTERING;    STATE;    INSULATOR;    SYMMETRY;    GAPS;    BAND;   

DOI  :  10.1103/PhysRevB.88.094502

来源: SCIE

【 摘 要 】

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/vertical bar t vertical bar = 1/3, coexistence of antiferromagnetism (AF) and superconductivity (SC) appears only for U/vertical bar t vertical bar > 10.6 and in a very narrow range of doping (delta less than or similar to 0.006) 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.

【 授权许可】

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