Abstract
The modified tight-binding approach (MTBA) used in calculations of the electron-phonon coupling in d-band metals was criticized before because the non-orthogonality of the wavefunctions was not taken into account. It is shown that the wavefunctions can be made orthogonal to first order in the overlap integrals. The modifications thus introduced in the electron-phonon matrix element are derived, and their impact on former calculations done in the MTBA is discussed.
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