Abstract
The frequency dependence of the ultrasonic attenuation coefficient in KMnF3 has been measured above the 186K structural transition temperature. For the transverse wave, a deviation from ω2-dependence has been obtained in the high frequency region and, for the longitudinal wave, a noticeable deviation from ω2-dependence has been obtained in a frequency region from 20 to 285 MHz. The both data have been fitted by the single relaxation formula: α = Cω2T/(1 + ω2T2), yielding long relaxation time T between 0.5 ∼ 4 × 10-9 sec and Cbetween 0.8 ∼ 8 × 10-9 sec/cm, on cooling from 189.9K to 186.7K. Hence the relaxation time clearly shows critical slowing-down.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
