Systematic Raman Scattering Study on Substitutional Effects in Solid Solution Systems of Ln 1+x Ba 2-x Cu 3 O y (Ln=Eu, Sm and La)

We have carried out a Raman spectroscopic study on the effect of substituting trivalent rare-earth ions (Ln=Eu, Sm and La) for Ba in LnBa 2 Cu 3 O y ( y =6–7) into the chemical form of Ln 1+ x Ba 2- x Cu 3 O y (0≤ x ≤0.4). The oxygen vibrational mode in the BaO plane is influenced by the substitutio...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1989-10, Vol.28 (10A), p.L1757
Main Authors: Yoshida, Naoki, Nishitani, Ryusuke, Sasaki, Yoshiro, Nishina, Yuichiro
Format: Article
Language:English
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Summary:We have carried out a Raman spectroscopic study on the effect of substituting trivalent rare-earth ions (Ln=Eu, Sm and La) for Ba in LnBa 2 Cu 3 O y ( y =6–7) into the chemical form of Ln 1+ x Ba 2- x Cu 3 O y (0≤ x ≤0.4). The oxygen vibrational mode in the BaO plane is influenced by the substitution through significant changes in the phonon frequency and peak intensity. On the other hand, the bending mode in the CuO 2 plane does not show appreciable variation with an increase in x . These results are common to the cases where Ln=Eu, Sm and Nd, but not to Ln=La, and are interpreted in terms of the oxygen defect and hole-concentration compensation.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.28.L1757