Anomalous scattering rate and microwave absorption in Bi₂Sr₂CaCu₂O₈₊δ and Y Ba₂Cu₃O₇₋δ
Originally posted at http://arxiv.org/abs/cond-mat/0102288v1.
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.
C. Kusko, Z. Zhai, R. S. Markiewicz, and S. Sridhar. 2001. "Anomalous scattering rate and microwave absorption in Bi₂Sr₂CaCu₂O₈₊δ and Y Ba₂Cu₃O₇₋δ" Physics Faculty Publications
Available at: http://works.bepress.com/ssridhar/5