Quasiparticle Formation and Optical Sum Rule Violation in Cuprate Superconductors

Details Quasiparticle Formation and Optical Sum Rule Violation in Cuprate Superconductors Quasiparticle Formation and Optical Sum Rule Violation in Cuprate Superconductors

2002-01-23

arxiv.org/abs/cond-mat/0201415v1

Phys. Rev. B 66, 100506(R) (2002)

Physics

Condensed Matter

Superconductivity

5 pages, revtex, 4 encapsulated postscript figures

Scientific paper

10.1103/PhysRevB.66.100506

Using a simple model for the frequency dependent scattering rate, we evaluate the in-plane optical integral for cuprate superconductors in the normal and superconducting states. In the overdoped region, this integral is conserved. In the optimal and underdoped region, though, the optical integrals differ, implying a lowering of the in-plane kinetic energy in the superconducting state. This sum rule violation, due to the difference of the non Fermi liquid normal state and the superconducting Fermi liquid state, has a magnitude comparable to recent experimental results.

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