Pseudogap and Superconducting Gap in the Electronic Raman Spectra of Underdoped Cuprates
R. Nemetschek, M. Opel, C. Hoffmann, P. F. Müller, R. Hackl, H. Berger, L. Forró, A. Erb, E. Walker
DOI 10.1103/PhysRevLett.78.4837 · Physical Review Letters
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Abstract
Raman spectra of YBa2Cu3O7−x and Bi2Sr2(Ca0.62Y0.38)Cu2O8+δ with Tc≅0.65Tcmax in the underdoped regime of the phase diagram are studied as a function of temperature and polarization. At B2g (xy) symmetry a reduction of spectral weight by 10% for frequencies less than 700cm−1 or 15kBTc is found below approximately 200 K. Below Tc, a superconducting gap opens up which closely resembles that observed at higher doping levels. It is compatible with dx2−y2 pairing and its amplitude 2Δ0 can be estimated to be 8kBTc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2Ca0.62Y0.38Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 57 | Pressure not reported | midpoint |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 53.5 | Pressure not reported | unknown |
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