Temperature-modulation analysis of superconductivity-induced transfer of in-plane spectral weight in Bi2Sr2CaCu2O8
A. B. Kuzmenko, H. J. A. Molegraaf, F. Carbone, D. van der Marel
DOI 10.1103/PhysRevB.72.144503 · Physical Review B
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Abstract
We examine the superconductivity-induced redistribution of optical spectral weight in Bi2Sr2CaCu2O8 near optimal doping using a detailed Kramers-Kronig consistency analysis of the kink (slope change) at Tc of the temperature-dependent optical spectra, published earlier [H. J. A. Molegraaf et al., Science 295, 2239 (2002)]. We demonstrate that the temperature dependence of the complex dielectric function at high frequencies (above 0.75eV) imposes the most stringent limits on the possible changes of the low-frequency integrated spectral weight. The presented calculations provide additional arguments, supporting the previous conclusion about a superconductivity-induced increase of the integrated low-frequency spectral weight below Tc. The Ferrell-Glover-Tinkham sum rule is not satisfied well above 2.5eV, which indicates that this increase is caused by the transfer of spectral weight from the interband to the intraband region and only partially by the narrowing of the Drude peak.
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. | 88 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 66 | Pressure not reported | onset |
| YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.7 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 86 | Pressure not reported | onset |
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