Abstract
The discovery of the superconducting compound Y1Ba2Cu3O7−δ (YBCO) has lead to many experimental and theoretical studies in the last few years. Besides the pure 1-2-3 material a lot of investigations were performed on various substitutions. We report measurements on the optical and electrical properties of ceramic and single crystal samples with different substitutions of Y by rare earth (RE) elements. Among the RE elements which can fully replace Y in the structure only Pr substitution leads to a non superconducting material with a semiconducting temperature dependence of the resistivity 123. With a variation of the Pr content of the samples it is possible to change the electrical properties from metallic/superconducting to semiconducting. Since IR and Raman measurements are a powerful tool to study the lattice dynamics and the interaction of lattice vibrations with the electronic system, several groups have investigated the influence of RE element substitution by this means 4 5 6.
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