Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 77, Issue 2, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.023708
Keywords
triangular lattice; three-fold charge order; extended Hubbard model; superconductivity; BCS mean-field approximation; organic conductor; theta-(BEDT-TTF)(2)X
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The quarter-filling extended Hubbard model on the triangular lattice is studied to explore pairing instability in the three-fold charge-ordered (CO) metal. We derive a second-order strong-coupling effective Hamiltonian of doped carriers into the three-fold CO insulator at electron density of n = 2/3, and then study the f- and d(xy)-wave superconductivities down to n = 1/2 by using the Bardeen-Cooper-Schrieffer mean-field approximation. It is found that the triplet f-wave pairing is more stable than the d(xy)-wave one. We also discuss that this coexisting state of the charge ordering and superconductivity is possible to have critical temperature T-c similar to 0.01t.
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