Relationship between T c and electronegativity differences in compound superconductors

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65. Equation (7) has a Lissajous-type relation between two frequencies. A more restricted resonance condition in the original resonance equation of [20] would require j/f a positive integer. Since f=1, 2 or 3, j/f=6i is required, where i is a positive integer, and the resonance equation becomes $$\omega _{\text{p}}^{{\text{CuO}}_{\text{2}} } = 6i\omega _{\text{r}}^{{\text{CuO}}_{\text{2}} }$$ . The near periodical absorptions above the gap in the tunneling measurements [J.F. Zasadzinski et al.: Physica C 162?164, 1053 (1989); L.H. Greene et al.: Physica C 162?164, 1069 (1989)] probably reflect a resonance condition related to the $$6i\omega _{\text{r}}^{{\text{CuO}}_{\text{2}} }$$ high frequency oxygen vibrations with selection rules to be exploited

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