Photoemission intensity and density of states in the superconducting state of Bi2Sr2CaCu2O8

S. Wermbter; L. Tewordt

doi:10.1103/PhysRevB.46.12061

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Photoemission intensity and density of states in the superconducting state of Bi2Sr2CaCu2O8

S. Wermbter, L. Tewordt

DOI 10.1103/PhysRevB.46.12061 · Physical Review B

T1

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Abstract

We calculate the photoemission spectrum and the density of states for a model of Bi2Sr2CaCu2O8 consisting of a narrow two-dimensional band and interactions due to exchange of phonons (α2F) and spin fluctuations. As T is decreased below Tc, we obtain in the photoemission (density of states) a narrow BCS-like peak, a smaller peak at lower (higher) energy, and a minimum between these two peaks. This is in qualitative agreement with photoemission and scanning-tunnel-microscope measurements. These features are caused by a peak in α2F at low energy and by the gapped spin fluctuation spectrum. We find also that the energy gap opens up more rapidly below Tc than the BCS gap.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	74	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown