Infrared diffuse reflectivity study of high-Tc superconductors
A. Rosenberg, A. S. Barker, T. W. Noh, T. Ohsaka, A. J. Sievers
DOI 10.1103/PhysRevB.41.7213 · Physical Review B
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Abstract
We have measured the spectral dependence of the diffuse reflectivity of polished sintered pellets of YBa2Cu3O7−y, La2−xSrxCuO4−y, and related superconducting and nonsuperconducting oxides between 500 and 5000 cm−1 at room temperature. The growth in ir scattering with decreasing frequency is qualitatively explained by the anisotropic conductivity of these materials. Even at its peak ir value the effect is too small to alter significantly the optical constants obtained from specular reflectivity measurements. Since no additional scattering occurs near 0.5 eV, the absorption observed in sintered pellets at that energy cannot be associated with an anisotropic electronic excitation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.88Sr0.12CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa1.5Sr0.5Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TmBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.85Sr0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.875Sr0.125CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.85Ba0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba0.6K0.4BiO3 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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