Velocity of Sound in Liquid Helium at Low Temperatures

1962 ◽  
Vol 9 (6) ◽  
pp. 243-245 ◽  
Author(s):  
W. M. Whitney ◽  
C. E. Chase
Keyword(s):  
Liquid Helium ◽  
Low Temperatures ◽  
Velocity Of Sound

scholarly journals Experiments at very low temperatures obtained by the magnetic method I—The production of the low temperatures

1935 ◽  
Vol 149 (866) ◽  
pp. 152-176 ◽  
Keyword(s):  
Liquid Helium ◽  
Vapour Pressure ◽  
Low Temperatures ◽  
Usual Method ◽  
Magnetic Method ◽  
Isothermal Magnetization

The lowest limit of temperature obtainable by the hitherto usual method of evaporating liquid helium lies at about 0⋅7º. At this temperature the vapour pressure of helium is already so small that it does not seem possible to proceed to appreciably lower temperatures in this way. In the course of last year the first successful experiments in attaining still lower temperatures were carried out using the magnetic method proposed by Debye and Giauque. This method is based on the possibility of diminishing considerably the entropy of some paramagnetic salts by isothermal magnetization. The subsequent demagnetization, if carried out adiabatically, then results in a lowering of the temperature.

scholarly journals Energy transfer between ripplons and phonons in liquid helium at low temperatures

1992 ◽  
Vol 46 (1) ◽  
pp. 575-577 ◽  
Author(s):  
M. W. Reynolds ◽  
I. D. Setija ◽  
G. V. Shlyapnikov
Keyword(s):  
Energy Transfer ◽  
Liquid Helium ◽  
Low Temperatures

The specific heat of metals and alloys at low temperatures

1957 ◽  
Vol 240 (1222) ◽  
pp. 321-332 ◽  
Keyword(s):  
Fermi Surface ◽  
Specific Heat ◽  
Liquid Helium ◽  
Brillouin Zone ◽  
Low Temperatures ◽  
Metals And Alloys ◽  
Thermal Excitation ◽  
Electronic Specific Heat ◽  
Conduction Electrons ◽  
Elastic Shear

The effect of thermal excitation of the conduction electrons on the elastic shear constants is investigated in a metal in which the Fermi surface lies close to the Brillouin-zone boundaries. It is shown that in these circumstances electron-lattice interaction leads to an addi­tional term in the specific heat, linear in the temperature in the liquid-helium range, which, therefore, augments the pure electronic specific heat. The variation in magnitude of this linear term is considered in the α-brasses. It is suggested that this is the physical effect underlying the peculiarities of the ‘electronic’ specific heat of these alloys.

scholarly journals Thermal boundary resistance between liquid helium and silver sinter at low temperatures

1996 ◽  
Vol 105 (1-2) ◽  
pp. 93-112 ◽  
Author(s):  
A. P. J. Voncken ◽  
D. Riese ◽  
L. P. Roobol ◽  
R. K�nig ◽  
F. Pobell
Keyword(s):  
Liquid Helium ◽  
Low Temperatures ◽  
Boundary Resistance ◽  
Thermal Boundary Resistance ◽  
Silver Sinter

Measurements on the velocity of sound in helium gas at liquid helium temperatures

Physica ◽  
1958 ◽  
Vol 24 (1-5) ◽  
pp. 59-67 ◽  
Author(s):  
A. van Itterbeek ◽  
W. de Laet
Keyword(s):  
Liquid Helium ◽  
Velocity Of Sound ◽  
Helium Gas

Apparatus to measure the velocity of sound down to liquid helium temperatures with the optical method

Physica ◽  
1954 ◽  
Vol 20 (1-6) ◽  
pp. 307-310 ◽  
Author(s):  
A. Van Itterbeek ◽  
G.J. Van Den Berg ◽  
W. Limburg
Keyword(s):  
Liquid Helium ◽  
Optical Method ◽  
Velocity Of Sound
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