Phenomenology of Photoemission Lineshapes of High Tc Superconductors

Details Phenomenology of Photoemission Lineshapes of High Tc Superconductors Phenomenology of Photoemission Lineshapes of High Tc Superconductors

1997-11-21

arxiv.org/abs/cond-mat/9711232v1

Phys. Rev. B 57, R11093 (1998)

Physics

Condensed Matter

Superconductivity

4 pages, revtex, 3 encapsulated postscript figures

Scientific paper

10.1103/PhysRevB.57.R11093

We introduce a simple phenomenological form for the self-energy which allows us to extract important information from angle resolved photoemission data on the high Tc superconductor Bi2212. First, we find a rapid suppression of the single particle scattering rate below Tc for all doping levels. Second, we find that in the overdoped materials the gap Delta at all k-points on the Fermi surface has significant temperature dependence and vanishes near Tc. In contrast, in the underdoped samples such behavior is found only at k-points close to the diagonal. Near (pi,0), Delta is essentially T-independent in the underdoped samples. The filling-in of the pseudogap with increasing T is described by a broadening proportional to T-Tc, which is naturally explained by pairing correlations above Tc.

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