Title :
Ultrasonic measurement on the single crystal La2(1-x)Sr 2xCuO4
Author :
Yamaguchi, M. ; Suzuki, M. ; Okuda, Y.
Author_Institution :
Tokyo Inst. of Technol., Japan
Abstract :
Ultrasonic measurement was performed on single-crystal La2(1-x)Sr2xCuO4 (x=0.06) from 4.2 K to 300 K with emphasis on the anomalies near the superconducting transition, Tc, of 11 K and the structural phase transition, Td, of 251 K. A longitudinal wave was propagated parallel to the Cu-O plane. The sound velocity decreased gradually down to Td on cooling from room temperature. A large discontinuity of sound velocity from 5.2×10 3 m/s to 3.2×103 m/s was observed just at Td. The discontinuity of sound velocity at Tc was not found within the present resolution of ΔV/V≈10-6
Keywords :
high-temperature superconductors; lanthanum compounds; strontium compounds; superconducting transition temperature; ultrasonic velocity; (La1-xSrx)2CuO4; 4.2 to 300 K; discontinuity of sound velocity; high-temperature superconductor; longitudinal wave; single crystal; structural phase transition; superconducting transition; ultrasonic velocity; Acoustic measurements; Elasticity; Frequency; Phase measurement; Pulse measurements; Strontium; Superconductivity; Temperature; Ultrasonic variables measurement; Velocity measurement;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171556
