Title :
High resolution ultrasonic measurements of UPt3 at very low temperatures
Author :
Jin, C. ; Lee, D.M. ; Lin, S.-W. ; Levy, M. ; Sarma, Bimal K. ; Hinks, D.G.
Author_Institution :
Lab. of Atom. & Solid State Phys., Cornell Univ., Ithaca, NY, USA
Abstract :
Longitudinal sound velocity and attenuation measurements were performed on high-quality single-crystal UPt3 between 5 mK and 700 mK in zero magnetic field. The low temperatures reached in this experiment allow better comparison to the theoretical predictions of the longitudinal sound attenuation for different gap states. A significant dispersion of sound associated with the superconducting transition was observed. Within the resolution of the ultrasonic measurements on this sample, no manifestation of the recently reported specific heat anomaly around 18 mK was observed
Keywords :
heavy fermion superconductors; platinum alloys; superconducting transition temperature; ultrasonic absorption; ultrasonic dispersion; ultrasonic relaxation; ultrasonic velocity; uranium alloys; 5 to 700 mK; UPt3; US attenuation; US velocity; dispersion of sound; heavy-fermion superconductor; high resolution; high-quality single-crystal; longitudinal sound attenuation; relaxation process; superconducting transition; very low temperatures; zero magnetic field; Acoustic transducers; Amplitude modulation; Attenuation measurement; Frequency modulation; Laboratories; Magnetic field measurement; Physics; Radio frequency; Temperature dependence; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.275839
