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Study of gossamer superconductivity and antiferromagnetism in the t-J-U model | | Feng Yuan
; Qingshan Yuan
; C. S. Ting
; T. K. Lee
; | | Date: |
22 Sep 2004 | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Abstract: | The d-wave superconductivity (dSC) and antiferromagnetism are analytically studied in a renormalized mean field theory for a two dimensional t-J model plus an on-site repulsive Hubbard interaction $U$. The purpose of introducing the $U$ term is to partially impose the no double occupancy constraint by employing the Gutzwiller approximation. The phase diagrams as functions of doping $delta$ and $U$ are studied. Using the standard value of $t/J=3.0$ and in the large $U$ limit, we show that the antiferromagnetic (AF) order emerges and coexists with the dSC in the underdoped region below the doping $deltasim0.1$. The dSC order parameter increases from zero as the doping increases and reaches a maximum near the optimal doping $deltasim0.15$. In the small $U$ limit, only the dSC order survives while the AF order disappears. As $U$ increased to a critical value, the AF order shows up and coexists with the dSC in the underdoped regime. At half filing, the system is in the dSC state for small $U$ and becomes an AF insulator for large $U$. Within the present mean field approach, We show that the ground state energy of the coexistent state is always lower than that of the pure dSC state. | | Source: | arXiv, cond-mat/0409596 | | Services: | Forum | Review | PDF | Favorites | |
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