Abstract
We report on a study of temperature dependent far infrared reflectivity measurements of partly substituted YBCO ceramics with different carrier concentrations. Reflectivity spectra show, depending on the carrier concentration, high metallic reflectivity and strong phonon structures. A comparison of the data of these measurements shows that the temperature dependent phonon response clearly scales with T C. A theoretical fit based on the two fluid model can be used to describe the phonon behavior. The assumption of a superconducting gap derived from these measurements will be discussed. Below the critical temperatures a correlation between phonons and superconducting carriers was found. From these data an energy gap in the superconducting states can be estimated. The assumption of a superconducting BCS-like gap in the range of 3.2 k BT to 4.6 k BT is consistent with our data.
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