The electronic structure and the phonon modes of the superconducting cluster compounds LaB₆ and YB₆ are evaluated. They are used to calculate the Eliashberg function of both compounds within the rigid-muffin-tin approximation for electron-phonon coupling. The individual contributions from the different phonon branches are discussed. It turns out that nonlocal corrections to the electron-phonon coupling are essential for those modes where the B₆ octahedras move as a whole. Omission of these corrections leads to a large overestimate of λ and Tc.
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Schell et al. (1982) studied this question.
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