Dynamic conductivity and coherence peak in YBa2Cu3O7 superconductors
Martin C. Nuss, P. M. Mankiewich, M. L. O’Malley, E. H. Westerwick, Peter B. Littlewood
DOI 10.1103/PhysRevLett.66.3305 · Physical Review Letters
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure unresolved | zero_resistance |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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