Superconductivity in the Three-Fold Charge-Ordered Metal of the Triangular-Lattice Extended Hubbard Model(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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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〜0.01t.
- 社団法人日本物理学会の論文
- 2008-02-15
著者
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Fukumoto Yoshiyuki
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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MOROHOSHI Shotaro
Department of Physics, Faculty of Science and Technology, Tokyo University of Science
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Morohoshi Shotaro
Department Of Physics Faculty Of Science And Technology Tokyo University Of Science
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