First-principles phonon spectra in Ca and Sr

Experimental phonon spectra for the fcc alkaline-earth metals Ca and Sr have only recently been obtained. First-principles, generalized-pseudopotential-theory predictions of these spectra, including the full effects of d-state hybridization, are reported and compared with these results. The overall agreement between theory and experiment is found to be quite good (within about 10%). In addition, anomalous behavior observed in the T/sub 1/(110) branch for single-crystal Ca is also found theoretically.