Coexistence of superconductivity and antiferromagnetism in self-doped bilayer t-t'-J model

Details Coexistence of superconductivity and antiferromagnetism in self-doped bilayer t-t'-J model Coexistence of superconductivity and antiferromagnetism in self-doped bilayer t-t'-J model

2008-07-17

arxiv.org/abs/0807.2688v1

Phys. Rev. B 78, 094504 (2008).

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.78.094504

A self-doped bilayer t-t'-J model of an electron- and a hole-doped planes is studied by the slave-boson mean-field theory. A hopping integral between the differently doped planes, which are generated by a site potential, are renormalized by the electron-electron correlation. We find coexistent phases of antiferromagnetic (AFM) and superconducting orders, although the magnitudes of order parameters become more dissimilar in the bilayer away from half-filling. Fermi surfaces (FS's) with the AFM order show two pockets around the nodal and the anti-nodal regions. These results look like a composite of electron- and hole-doped FS's. In the nodal direction, the FS splitting is absent even in the bilayer system, since one band is flat due to the AFM order.

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