Evidence of the pseudogap and superconducting gap in the ab-plane electronic Raman continuum of YBa2Cu4O8
J. W. Quilty, S. Tajima, S. Adachi, A. Yamanaka
DOI 10.1103/PhysRevB.65.094513 · Physical Review B
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Abstract
In contrast to a number of prior studies, our plane-polarized Raman measurements of YBa2Cu4O8 single crystals display evidence of pseudogap and superconducting gap effects. With decreasing temperature in the normal state a continuous depletion of spectral weight from the electronic continuum is observed below 250 K, extending to around 1200 cm−1. The normal state depletion is immediately reversed as the sample is cooled below Tc and a very broad peak forms in the electronic continuum. A broad feature peaked at a Raman shift of 850 cm−1 also emerges around Tc, and appears to be linked with two-phonon Raman scattering. By application of a simple model, the phonons and pseudogap depletion are removed from the spectra revealing a normal-state electronic Raman continuum with a frequency and temperature dependence typical of a high-Tc cuprate superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | onset |
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