Low-Temperature Density and Solubility ofHe3in LiquidHe4under Pressure

Specific heat of liquid $sup 3$He in sintered copper below 3 mK

Equations describing a change in the thermodynamic parameters of a first-order phase transition in para-and diamagnetic substances under the action of a homogeneous magnetic field are derived. It is shown that the magnetic field effect on the phase transition parameters is negligibly small in the regions of the phase diagram where the P-T curves vary monotonically. However, the applied magnetic field may significantly change the T

 f
 and P

 f
 values in the regions where either P

 f
 (T) or T

 f
 (P) curves exhibit extrema. Substances in which this effect can be observed are indicated.

On the Magnetic-Field-Induced Changes in the Parameters of Phase Transitions

It is shown that the widely used method for determining Gruneisen parameter γ of a solid from experimental data on thermal expansion coefficient αp, elastic modulus BT, volume V, and heat capacity C, γ = αpBTV/C, is valid only when the Debye temperature Θ does not depend on temperature T. It is shown that if function Θ exhibits a temperature dependence, this method becomes not quite correct (especially for quantum crystals). A correct expression is derived for calculating the Gruneisen parameter and the upper and lower bounds for function γ(T) are determined.

On determination of the Grüneisen parameter from experimental data

A single charge 3He–4He dilution refrigerator operating from a 3He stage at 0.3 K is described. The lowest temperature produced with this refrigerator was 0.027 K. The refrigerator was simple to construct and relatively easy to operate. The apparatus was well suited for very low temperature experiments where extended operation was not required.

A Single Charge 3He–4He Dilution Refrigerator

Properties of He 3 and of its solutions in He 4

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Properties of He 3 and of its solutions in He 4