Abstract
We observed a strong softening of longitudinal acoustic modes in ${\mathrm{UPt}}_{3}$ and ${\mathrm{CeRu}}_{2}$${\mathrm{Si}}_{2}$ in high magnetic fields where the magnetic susceptibility exhibits an anomaly. The two phenomena can be correlated with a large electronic Gr\"uneisen parameter. Some shear modes exhibit oscillations in the same high-field and low-temperature range.
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