Phys. Rev. Lett. 66, 3305–3308 (1991)Dynamic conductivity and coherence peak in YBa2Cu3O7 superconductorsReceived 9 April 1991; published in the issue dated 24 June 1991 We measure directly both the real and imaginary parts of the sub-band-gap conductivity σ in YBa2Cu3O7 in the 15–80 cm-1 frequency range using coherent time-domain terahertz spectroscopy. We observe a peak in the real part σ1 similar to the coherence peak expected in an s-wave BCS superconductor. The absence of such a peak in NMR relaxation-rate experiments suggests that its origin lies in a strongly temperature-dependent inelastic-scattering rate rather in coherence factors. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.66.3305
DOI:
10.1103/PhysRevLett.66.3305
PACS:
74.30.Gn, 74.70.Vy, 78.47.+p, 84.40.Cb
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