Using density-functional linear-response theory, we calculate the electron-phonon interaction for s- and d-wave pairing in the 0.24 hole doped infinite-layer compound CaCuO₂. We find lambda (x²-y²) ~ 0.3 to be positive and only slightly smaller than lambda(s) ~ 0.4. This suggests that the electron-phonon mechanism alone is insufficient to explain the high T_c but could enhance another d-wave pairing mechanism. Results of calculated lattice dynamics and transport properties are also presented and discussed. Out-of-plane distortions are found essential for the stability.
 

Physical Review Letters, 77 4430-3, 1996.

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