Observation of the conductivity coherence peak in superconducting Bi2Sr2CaCu2O8 single crystals
K. Holczer, L. Forro, L. Mihály, G. Grüner
DOI 10.1103/PhysRevLett.67.152 · Physical Review Letters
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Abstract
We have measured the surface impedance of Bi2Sr2CaCu2O8 single crystals and have evaluated the conductivity σ1 at millimeter-wave frequencies. We observe a peak below Tc which we suggest is due to case-II coherence factors, like the Hebel-Slichter peak observed in the NMR relaxation rate of classical superconductors. A comparison with theory leads to a large gap, suggesting strong coupling.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NdBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | unknown |
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