Bosonic Spectral Density of Epitaxial Thin-Film La1.83Sr0.17CuO4 Superconductors from Infrared Conductivity Measurements
J. Hwang, E. Schachinger, J. P. Carbotte, F. Gao, D. B. Tanner, T. Timusk
DOI 10.1103/PhysRevLett.100.137005 · Physical Review Letters
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Abstract
We use optical spectroscopy to investigate the excitations responsible for the structure in the optical self-energy of thin epitaxial films of La1.83Sr0.17CuO4. Using Eliashberg’s formalism to invert the optical spectra we extract the electron-boson spectral function and find that at low temperature it has a two component structure closely matching the spin excitation spectrum recently measured by magnetic neutron scattering. We contrast the temperature evolution of the spectral density and the two-peak behavior in La2−xSrxCuO4 with another high temperature superconductor Bi2Sr2CaCu2O8+δ. The bosonic spectral functions of the two materials account for the low Tc of LSCO as compared to Bi-2212.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.83Sr0.17CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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