Raman and magnetic susceptibility evidence for a structural transition in (Eu1.5−xPrxCe0.5)Sr2Cu2NbO10 compounds
✍ Scribed by M. Bennahmias; H. B. Radousky; H. E. Lorenzana; T. J. Goodwin; R. N. Shelton
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 70 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0377-0486
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✦ Synopsis
Understanding the unique role that Pr hybridization plays in promoting both the suppression of superconductivity and the onset of complex magnetism in high-T C cuprates continues to be a dynamic area of research. Complex magnetic behavior is well known to occur in the (Pr 1.5 Ce 0.5 )Sr 2 Cu 2 MO 10 (M = Nb or Ta) compounds. Previously, two temperature-dependent transitions have been identified through magnetic susceptibility studies for the series of solid solutions (Eu 1.5-x Pr x Ce 0.5 )Sr 2 Cu 2 NbO 10 (0.0 Ä x Ä 1.5). In this paper, we present new measurements of the Raman-active modes and the magnetic susceptibility for these latter compounds. The data indicate a discontinuity in concentration space at a Pr doping level of x = 1.0, that we interpret as the signature of a subtle phase transition.