Abstract
Raman scattering spectra of single crystals of (Eu2/3Ce1/3)2 Ba2/3Eul/3)2Cu3O8+z (Eu-223) and (Er2/3 Ce1/3)2(Ba2/3La1/3)2 Cu3O8+z (ErLa-223) have been measured at room temperature. A peak due to magnon-pair scattering has been observed at 2600 cm−1 in the spectra of semiconducting Eu-223 but not in superconducting Eu-223. The exchange integral is estimated as 960cm−1, which is nearly the same as that of semiconducting YBa2Cu3O6+z. On the other hand, magnon scattering peak has not been seen in the spectra of nonsuperconducting ErLa-223. This fact suggests that sufficient carriers are doped in the Cu-O2 planes in this material though it does not show superconductivity.
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© 1992 Springer-Verlag Berlin, Heidelberg
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Yoshida, M. et al. (1992). Possibility of Superconductivity Destruction Caused by Neither the Reduction of Hole Concentration nor Impurity Doping. In: Iye, Y., Yasuoka, H. (eds) The Physics and Chemistry of Oxide Superconductors. Springer Proceedings in Physics, vol 60. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77154-5_84
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DOI: https://doi.org/10.1007/978-3-642-77154-5_84
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