Novel magnetoacoustic effects in heavy-Fermion systems in high magnetic fields

Abstract
We observed a strong softening of longitudinal acoustic modes in UPt3 and CeRu2 Si2 in high magnetic fields where the magnetic susceptibility exhibits an anomaly. The two phenomena can be correlated with a large electronic Grüneisen parameter. Some shear modes exhibit oscillations in the same high-field and low-temperature range.

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