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1992170 citationsJournal Article

Authors

D. B. Romero · Brookhaven National Laboratory

C. D. Porter · University of Florida

D. B. Tanner · Northrop Grumman (United States)

L. Forró · Brookhaven National Laboratory

David Mandrus · Brookhaven National Laboratory

L. Mihály · State University of New York

G. L. Carr ·

Abstract

The low-frequency conductivity ${\mathrm{\ensuremath{\sigma}}}_{1}$(\ensuremath{\omega}) of ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8}$ has a Drude-like component below ${\mathit{T}}_{\mathit{c}}$. Interpreting the width of this component as the quasiparticle relaxation rate (${\mathrm{\ensuremath{\tau}}}^{\mathrm{\ensuremath{-}}1}$), we find that ${\mathrm{\ensuremath{\tau}}}^{\mathrm{\ensuremath{-}}1}$ decreases dramatically just below ${\mathit{T}}_{\mathit{c}}$, in sharp contrast with the T-linear ${\mathrm{\ensuremath{\tau}}}^{\mathrm{\ensuremath{-}}1}$ above ${\mathit{T}}_{\mathit{c}}$ and ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CuO}}_{6}$. This decrease causes a peak in ${\mathrm{\ensuremath{\sigma}}}_{1}$(\ensuremath{\omega}\ensuremath{\rightarrow}0,T) for T just below ${\mathit{T}}_{\mathit{c}}$, 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 ${\mathit{T}}_{\mathit{c}}$.

Topics & Keywords

Physics of Superconductivity and Magnetism Advanced Condensed Matter Physics Multiferroics and related materials

Publication Details

Published in: Physical Review Letters

Volume 68, Issue 10, pp. 1590-1593

DOI: 10.1103/physrevlett.68.1590

Field-Weighted Citation Impact: 10.47

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