Self-consistent numerical study of pure and impurity doped three-band Hubbard model |
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Authors: | Prasenjit Sen Avinash Singh |
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Institution: | (1) Department of Physics, Indian Institute of Technology, 208 016 Kanpur, India |
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Abstract: | The three-band Hubbard model — both pure and with static non-magnetic impurities — has been studied within a self-consistent
numerical Hartree-Fock (HF) scheme. The system shows nesting properties only in the absence of direct O-O hopping. Spin excitations
in the system are gapless with the existence of a Goldstone mode in the broken-symmetry state. The variation of spinwave velocity
with Cu-site Coulomb repulsion shows a (1/(2U
d)+(1/Δ)) dependence in the strong-coupling limit. Each non-magnetic impurity in the system gives rise to two gap states for
a particular spin and the local moment produced is robust even at finite concentration of mobile hole doping. The gapless
Goldstone mode is preserved even in case of unequal concentration of impurities on the two sublattices. |
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Keywords: | Three-band Hubbard model charge-transfer insulator Mott-Hubbard insulator highT c superconductor impurity |
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