Pseudogap and Superconducting Fluctuation in High-T_c Cuprates : Theory beyond 1-Loop Approximation (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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The pseudogap phenomena induced by the SC fluctuation are investigated in details. We perform a calculation beyond the 1-loop approximation. The SC fluctuation is microscopically derived on the basis of the repulsive Hubbard model. The vertex corrections are collected in the infinite order with use of the quasi-static approximation. The single-particle excitations, NMR 1/T_1T, spin susceptibility and superconducting transition temperature are discussed. The important role of the vertex correction is pointed out for the single particle spectral function. On the other hand, the validity of the 1-loop order theory is confirmed for other quantities. We shed light on the essential nature of SC fluctuation leading to the pseudogap from the comparison with spin and charge fluctuations.
- 社団法人日本物理学会の論文
- 2004-04-15
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