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In this talk I provide an overview on the spin fluctuation scenario using the FLEX approach I discuss the basic idea and various extensions we did over the last years
bilayer effects ('96-'99) inclusion of a pseudogap ('97-'02) amplitude fluctuations (FLEX + T-matrix, '97-'03) Cooper-pair phase fluctuations (combination with BKT theory, '98-'03) and, finally, combination with response theory ('96-now). Furthermore, I contrast FLEX with other approaches, e.g. the spin-fermion model. Finally, I present calculation of the elementary excitations for hole- and electron-doped cuprates and compare with the kink in ARPES and resonance peak in inelastic neutron scattering experiments. |
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