Acoustic anomalies in UPt{3} at high magnetic fields and low temperatures.
Ultrasound velocity and attenuation measurements were performed on single crystals of the heavy fermion compound UPt{sub 3} in magnetic fields up to 33 T and at temperatures ranging from 2.4 K to below 0.1 K. With longitudinal sound propagated in the crystallographic basal plane, parallel to the applied field, the familiar elastic softening is observed at the metamagnetic transition field H-20.2 T. More complicated structure emerges at low temperatures, including quantum acoustic oscillations and a second velocity minimum at -21.6 T. A weak frequency dependence (dispersion) is observed in the velocity. The ultrasonic data are analyzed using the Landau-Khalatnikov formalism, from which temperature- and field-dependent relaxation times are deduced.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); OGA
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 943169
- Report Number(s):
- ANL/MSD/JA-37983; TRN: US1000569
- Journal Information:
- Phys. Rev. B, Vol. 62, Issue 17 ; Nov. 1, 2000; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
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