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Phys. Rev. Lett. 68, 1590–1593 (1992)

Quasiparticle damping in Bi2Sr2CaCu2O8 and Bi2Sr2CuO6

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D. B. Romero, C. D. Porter, D. B. Tanner, L. Forro, D. Mandrus, L. Mihaly, G. L. Carr, and G. P. Williams
Department of Physics, University of Florida, Gainesville, Florida 32611
Department of Physics, State University of New York, Stony Brook, New York 11794
Grumman Corporate Research Center, Bethpage, New York 11714
National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973

Received 25 November 1991; published in the issue dated 9 March 1992

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.

© 1992 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.68.1590
DOI:
10.1103/PhysRevLett.68.1590
PACS:
74.30.Gn, 74.70.Vy, 78.47.+p, 84.40.Cb
 
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