Quasiparticle damping in Bi2Sr2CaCu2O8 and Bi2Sr2CuO6
Abstract
The low-frequency conductivity σ1(ω) of Bi2Sr2CaCu2O8 has a Drude-like component below Tc. Interpreting the width of this component as the quasiparticle relaxation rate (τ-1), we find that τ-1 decreases dramatically just below Tc, in sharp contrast with the T-linear τ-1 above Tc and Bi2Sr2CuO6. This decrease causes a peak in σ1(ω-->0,T) for T just below Tc, a peak which is due to the scattering rate and not to pair coherence effects, consistent with the lack of a coherence peak in the NMR relaxation rate. This result implies that the excitations which scatter the carriers are suppressed below Tc.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 1992
- DOI:
- 10.1103/PhysRevLett.68.1590
- Bibcode:
- 1992PhRvL..68.1590R
- Keywords:
-
- 74.30.Gn;
- 74.70.Vy;
- 78.47.+p;
- 84.40.Cb;
- Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter