Ultrasonic study of URu2Si2At very low temperatures

A. Suslov*, M. Williamsen, J. B. Ketterson, D. G. Hinks, Bimal K. Sarma

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The velocity of longitudinal ultrasound propagated along the a axis in URu2Si2 has been studied at temperatures down to 40 mK and in magnetic fields of up to 45 T applied along the c axis. The frequencies of the observed acoustic quantum oscillations (560 T and 1070 T), as well as calculated effective masses (14.5me and 22me), are in reasonable agreement with the known dHvA extremal cross sections of the Fermi surface in URu2Si2. It is shown that features observed previously at temperatures of about 0.5 K in magnetic fields between about 29 and 30 T in the magnetoresistance. Hall coefficient and ultrasound velocity are associated with quantum oscillations, which are clearly seen at lower temperatures. A hysteresis observed at 40 mK for all three steps of the metamagnetic transition confirms that they all are first order transitions.

Original languageEnglish (US)
Title of host publicationLOW TEMPERATURE PHYSICS
Subtitle of host publication24th International Conference on Low Temperature Physics - LT24
Number of pages2
StatePublished - 2006
EventLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24 - Orlando, FL, United States
Duration: Aug 10 2006Oct 17 2006

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


OtherLOW TEMPERATURE PHYSICS: 24th International Conference on Low Temperature Physics - LT24
Country/TerritoryUnited States
CityOrlando, FL


  • Heavy-fermions
  • Metamagnetism
  • Ultrasound

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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