Superconducting energy gap and normal-state conductivity of a single-domain YBa2Cu3O7 crystal
Z. Schlesinger, R. T. Collins, F. Holtzberg, C. Feild, S. H. Blanton, U. Welp, G. W. Crabtree, Y. Fang, J. Z. Liu
DOI 10.1103/PhysRevLett.65.801 · Physical Review Letters
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Abstract
Using polarized reflectivity measurements of single-domain crystals, we are able to distinguish chain and plane contributions to the infrared conductivity of YBa2Cu3O7. A substantial chain contribution to σ(ω) persisting to low frequency and temperature is observed. For the intrinsic conductivity of the CuO2 planes a superconducting energy gap of 500 cm−1 (2Δ/kTc≃8) is evident in the infrared data, while the normal-state conductivity drops much more slowly with ω than the ordinary Drude form, and can be described in terms of a scattering rate ħ/τ*∼kT+ħω at low frequency. The former result (2Δ/kTc≃8) suggests suppression of Tc; the latter, that YBa2Cu3O7 is not an ordinary Fermi liquid.
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. | 90 | Pressure not reported | onset |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
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