We determine the scattering rate from microwave measurements for an optimally doped Bi-2212 single crystal, using a simple two fluid model with a d-wave symmetry order parameter. In the superconducting state, the calculated scattering rate is three orders of magnitude smaller than that determined from ARPES experiments. A similar anomalously large decrease in the scattering rate is also required to explain the data within a gap-quasiparticle scenario for other HTS, such as Y Ba₂Cu₃O₇₋δ. The results suggest that the assumption of normal excitations vanishing at low T is invalid and an additional charge mode is responsible for the microwave absorption.
scattering rate, Bi-2212 single crystal, two fluid model, d-wave symmetry order parameter, microwave absorption, Bi₂Sr₂CaCu₂O₈₊δ, Y Ba₂Cu₃O₇₋δ
Scattering (Physics), Superconductivity
Kusko, C.; Zhai, Z.; Markiewicz, R. S.; and Sridhar, S., "Anomalous scattering rate and microwave absorption in Bi₂Sr₂CaCu₂O₈₊δ and Y Ba₂Cu₃O₇₋δ" (2001). Physics Faculty Publications. Paper 30. http://hdl.handle.net/2047/d20000383
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