Longitudinal and Transverse Ultrasonic Velocity Measurements in Bi2Sr2CuO6. Influence of the Anisotropy on the Elastic Constants

1993 ◽  
Vol 135 (2) ◽  
pp. K51-K53 ◽  
Author(s):  
J. Dominec ◽  
C. Laermans
Keyword(s):  
Ultrasonic Velocity ◽  
Elastic Constants ◽  
Velocity Measurements

ELASTIC EFFECTS IN SOME FERROMAGNETIC URANIUM PNICTIDES

1993 ◽  
Vol 07 (01n03) ◽  
pp. 212-215 ◽  
Author(s):  
D. KACZOROWSKI ◽  
D. FINSTERBUSCH ◽  
B. LÜTHI
Keyword(s):  
Phase Transition ◽  
Temperature Dependence ◽  
Ultrasonic Velocity ◽  
Elastic Constants ◽  
Magnetic Phase Transition ◽  
Sound Propagation ◽  
Magnetic Phase ◽  
Velocity Measurements ◽  
Single Crystalline

The results of ultrasonic velocity measurements on single-crystalline U 3 P 4, UCuP 2 and UCuAs 2 ferromagnets are presented. For cubic U 3 P 4 the temperature dependence of all three non-zero elastic constants c 11, c 12 and c 44 has been derived. All of them exhibit a strong softening In the vicinity of T C but particularly large effect (~13%) is observed in the case of the shear constant c 12. For tetragonal UCuP 2 and UCuAs 2 the sound propagation along the c-axis has only been studied. In UCuP 2 both the c 33 and c 44 constants show a strong softening near the magnetic phase transition (~ 7%). Much smaller anomalies in elastic constants at T C and an unusual temperature dependence of c 44 In the ferromagnetic region are observed for the arsenide.

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