Strong-coupling theory of electronic Raman scattering in high-temperature superconductors
T. Dahm, D. Manske, L. Tewordt
DOI 10.1103/PhysRevB.59.14740 · Physical Review B
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Abstract
We have calculated the response function for electronic Raman scattering within the fluctuation-exchange approximation for the two-dimensional Hubbard model. Below Tc, a large pair-breaking peak and a gap develop in the B1g spectrum while the effect of superconductivity on the B2g spectrum is much smaller. In order to investigate the underdoped regime we study the influence of a phenomenologically introduced pseudogap. In the normal state we find that this pseudogap leads for decreasing temperature to development of a d-wave gap structure in the density of states which merges continuously into the superconducting spectrum. A corresponding pair-breaking peak evolves continuously in the B1g Raman spectrum as T decreases in the normal state and below Tc. We discuss our results in connection with recent tunneling, optical conductivity, and Raman data on the cuprates.
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 |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 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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