Title :
Ultrasonic measurements in the CeCu6 Kondo compound
Author :
Lin, S.-W. ; Ran, Q.Z. ; Adenwalla, S. ; Zhao, Z. ; Edelstein, A. ; Das, B.N. ; Ketterson, B. ; Sarma, B.K. ; Levy, M.
Author_Institution :
Dept. of Phys., Wisconsin Univ., Milwaukee, WI, USA
Abstract :
Attenuation and velocity measurements were performed on a single crystal of CeCu6 from 50 mK up to room temperature with longitudinal waves propagating along the a axis of this crystal. An increase in attenuation and a small peak in velocity were seen at around 210 K, where an orthorhombic to monoclinic structural transition occurs. A maximum in attenuation (at 130 MHz) was observed at 2.5 K, which appears to be in the vicinity of the Kondo temperature. Below 2 K the attenuation (at 300 MHz) increases monotonically down to 50 mK. Field sweeps up to 8 T at 70 mK and 1 K showed that the velocity has a large change in both cases, but at 70 mK the amount of change is about 15% larger than at 1 K
Keywords :
Kondo effect; cerium alloys; copper alloys; magnetoacoustic effects; ultrasonic absorption; ultrasonic velocity; 130 to 300 MHz; 50 mK to 295 K; 8 T; CeCu6 Kondo compound; CeCu6 single crystal; US measurements; attenuation measurements; longitudinal waves; orthorhombic to monoclinic structural transition; velocity measurements; Attenuation measurement; Conductivity; Electrons; Fluctuations; High temperature superconductors; Magnetic separation; Superconducting magnets; Temperature dependence; Ultrasonic variables measurement; Velocity measurement;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171575
