Superconducting Gap Anisotropy and Quasiparticle Interactions: a Doping Dependent ARPES Study

Details Superconducting Gap Anisotropy and Quasiparticle Interactions: a Doping Dependent ARPES Study Superconducting Gap Anisotropy and Quasiparticle Interactions: a Doping Dependent ARPES Study

1998-12-23

arxiv.org/abs/cond-mat/9812377v2

Phys. Rev. Lett. 83, 840 (1999)

Physics

Condensed Matter

Superconductivity

4 pages, 3 eps figs, manuscript and Fig. 3 significantly revised

Scientific paper

10.1103/PhysRevLett.83.840

Comparing ARPES measurements on Bi2212 with penetration depth data, we show that a description of the nodal excitations of the d-wave superconducting state in terms of non-interacting quasiparticles is inadequate, and we estimate the magnitude and doping dependence of the Landau interaction parameter which renormalizes the linear T contribution to the superfluid density. Furthermore, although consistent with d-wave symmetry, the gap with underdoping cannot be fit by the simple coskx-cosky form, which suggests an increasing importance of long range interactions as the insulator is approached.

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