Attenuation of First Sound Near the Lambda Transition of Liquid Helium

1970 ◽  
Vol 25 (5) ◽  
pp. 276-280 ◽  
Author(s):  
R. D. Williams ◽  
I. Rudnick
Keyword(s):  
Liquid Helium ◽  
First Sound ◽  
Lambda Transition

Thermodynamic velocity and dispersion of first sound in liquid helium near the lambda transition

Cryogenics ◽  
1994 ◽  
Vol 34 ◽  
pp. 337-340
Author(s):  
Fernanda Miguélez ◽  
Oscar Cabeza ◽  
Carolina Torrón ◽  
Luisa Segade ◽  
Alberto Pomar
Keyword(s):  
Liquid Helium ◽  
First Sound ◽  
Lambda Transition

FIRST SOUND IN LIQUID HELIUM AT HIGH PRESSURES

1953 ◽  
Vol 31 (7) ◽  
pp. 1156-1164 ◽  
Author(s):  
K. R. Atkins ◽  
R. A. Stasior
Keyword(s):  
Specific Heat ◽  
Liquid Helium ◽  
Carrier Frequency ◽  
High Pressures ◽  
Constant Pressure ◽  
Constant Density ◽  
Pulse Technique ◽  
Temperature Range ◽  
Specific Heats ◽  
First Sound

The velocity of ordinary sound in liquid helium has been measured in the temperature range from 1.2 °K. to 4.2 °K. at pressures up to 69 atm. A pulse technique was used with a carrier frequency of 12 Mc.p.s. Curves are given for the variation of velocity with temperature at constant pressure and also at constant density. There is no detectable discontinuity along the λ-curve. The results are used to discuss the ratio of the specific heats, the coefficient of expansion below 0.6 °K., and the specific heat above 3 °K.

scholarly journals Creation of quantized vortices at the lambda transition in liquid helium-4

1993 ◽  
Vol 93 (5-6) ◽  
pp. 1059-1067 ◽  
Author(s):  
P C Hendry ◽  
N S Lawson ◽  
R A M Lee ◽  
P V E McClintock ◽  
C D H Williams
Keyword(s):  
Liquid Helium ◽  
Quantized Vortices ◽  
Helium 4 ◽  
Lambda Transition

Dispersion of First Sound in Liquid Helium near theλTransition

1973 ◽  
Vol 31 (5) ◽  
pp. 283-286 ◽  
Author(s):  
W. C. Thomlinson ◽  
F. Pobell
Keyword(s):  
Liquid Helium ◽  
First Sound

Nonlinear first sound response of liquid helium at 1, 3 and 10 MHz

1979 ◽  
Vol 70 (2) ◽  
pp. 110-111 ◽  
Author(s):  
C.W. Smith ◽  
J.A. Rooney ◽  
R.F. Carey
Keyword(s):  
Liquid Helium ◽  
First Sound
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