Longitudinal mode Griineisen parameter

Longitudinal Mode Griineisen Parameter of PVAC. In an isotropic solid the longitudinal mode Griineisen parameter (LMGP) Yl relates the frequency fL of a longitudinal sound mode of a given wave vector q to the mass density p of the sample... 

Microscopically, an important contribution to the Griineisen parameter coupling in HF Ce compounds comes from a strong volume dependence of the sf-hybridization strength V k) (Allen and Martin 1982, Razafimandimby et al. 1984). Therefore, sound waves of compressional character, e.g., longitudinal modes modulate the mixing term in the Hamiltonian of eq. (107) and consequently couple to electronic states. For smaU displacements one can write... 

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