Temperature variation of the pseudogap in underdoped cuprates

Details Temperature variation of the pseudogap in underdoped cuprates Temperature variation of the pseudogap in underdoped cuprates

1997-11-05

arxiv.org/abs/cond-mat/9711041v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, Revtex, two figures (EPS-format)

Scientific paper

10.1103/PhysRevB.57.R11085

We consider thermal evolution of the spectral function A(Omega, T) in underdoped cuprates at T >Tc. We find that in the strong coupling limit, the fermionic Green's function near (0,\pi) behaves as G^{-1} (Omega) ~ \sqrt{Omega} in the whole frequency range relevant to photoemission experiments. The analysis of the pairing problem with this form of G yields a leading edge gap in A(\Omega) and a broad maximum at larger frequencies. We find that classical fluctuations predominantly add a frequency independent term to G^{-1} (Omega). This term destroys the leading edge gap at T =T* (k)$which has a maximum value of about 200K near (0,\pi).

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