Dynamic conductivity and coherence peak in YBa2Cu3O7 superconductors

Both the real and imaginary parts of the sub-band-gap conductivity sigma in YBa2Cu3O7 is measured directly in the 15-80/cm frequency range using coherent time-domain terahertz spectroscopy. A peak is observed in the real part sigma 1 similar to the coherence peak expected in an s-wave BCS supercondu...

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Bibliographic Details
Published in:Physical review letters 1991-06, Vol.66 (25), p.3305-3308
Main Authors: NUSS, M. C, MANKIEWICH, P. M, O'MALLEY, M. L, WESTERWICK, E. H, LITTLEWOOD, P. B
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary:Both the real and imaginary parts of the sub-band-gap conductivity sigma in YBa2Cu3O7 is measured directly in the 15-80/cm frequency range using coherent time-domain terahertz spectroscopy. A peak is observed in the real part sigma 1 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 lines in a strongly temperature- dependent inelastic-scattering rate rather than in coherence factors. (Author)
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.66.3305