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Phys. Rev. Lett. 85, 2569 - 2572 (2000)

Nodal Quasiparticle Lifetime in the Superconducting State of Bi2Sr2CaCu2O8+δ

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J. Corson and J. Orenstein
Materials Sciences Division, Lawrence Berkeley National Laboratory and Physics Department, University of California, Berkeley, California 94720

Seongshik Oh, J. O'Donnell, and J. N. Eckstein
Department of Physics, University of Illinois, Urbana, Illinois 61801

Received 14 March 2000

We have measured the complex conductivity σ of a Bi2Sr2CaCu2O8+δ thin film between 0.2 and 0.8 THz. We find σ in the superconducting state to be well described as the sum of contributions from quasiparticles, condensate, and order parameter fluctuations which draw 30% of the spectral weight from the condensate. An analysis based on this decomposition yields a quasiparticle scattering rate on the order of kBT/ħ for temperatures below Tc.


©2000 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.85.2569
DOI: 10.1103/PhysRevLett.85.2569
PACS: 74.25.Gz, 74.25.Nf, 74.72.Hs

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