The longitudinal ultrasonic attenuation and velocity on UPt3 have been measured in high magnetic fields up to 23 T and temperatures down to 2 K to study the heavy-fermion state. Earlier measurements had reported an attenuation peak at 12 K in temperature sweeps that was interpreted as a resonance with a narrow density of states at the Fermi surface, and a large dip in the velocity around 20 T (a softening due to a metamagnetic transition). The field dependence of the attenuation peak, its shift to lower temperatures and eventual merging with the peak in attenuation at the metamagnetic transition are discussed. The velocity was also measured and complementary features observed.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering