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Soft-Mode Behavior in Ternary Silicides MAlSi (M=Ca, Sr, Ba)

Author:
R. Heid   K. -P. Bohnen   B. Renker   P. Adelmann   T. Wolf   D. Ernst and H. Schober  


Journal:
Journal of Low Temperature Physics


Issue Date:
2007


Abstract(summary):

We present a combined experimental and theoretical investigation of the lattice dynamics and electron–phonon coupling of the ternary silicides MAlSi (M = Ca, Sr, Ba). Temperature dependent inelastic neutron-scattering measurements of the generalized phonon density-of-states provide evidence for a soft-mode behavior for CaAlSi which is absent for the other two compounds. Density-functional-based calculations of phonon spectra and electron–phonon coupling support this interpretation and identify the soft mode as strong coupling out-of-plane Al vibrations, in agreement with previous theoretical work. Observed differences in superconducting properties, in particular in T c , among the investigated compounds can be explained by the presence of the soft mode.


Page:
375-386


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