Low Frequency Raman Modes of Bi2 −x PbxSr1.6Ln0.4CuO6 −δ
Raman measurements were made on polycrystalline Bi2xPbxSr1:6Ln0:4CuO6 for Ln=fLa,Nd, Sm, Eug with various x and doping states. Our measurements suggest a signi cant Bicontribution to the 118cm1 mode but not to the 70cm1 mode which instead shifts to lowerfrequencies with increasing number of CuO2 layers in the Bi-based family. Shifts in the O(2)Srapical oxygen mode can be attributed to unit cell contraction within experimental error.
B. J. Ruck and T. Kemmitt
B. P. P. Mallett et al., "Low Frequency Raman Modes of Bi2 −x PbxSr1.6Ln0.4CuO6 −δ", Materials Science Forum, Vol. 700, pp. 11-14, 2012