THE EFFECTIVE MASS OF A CHARGED CARRIER IN A NONPOLAR LIQUID: APPLICATIONS TO SUPERFLUID HELIUM

The problem of a correct definition of the charged carrier effective mass in superfluid helium is revised. It is shown that the effective mass of such a quasi-particle can be introduced without Atkin's idea about the solidification of liquid He-4 in the close vicinity of an ion (the so-called 'snowball' model). Moreover, in addition to generalization of the Atkin's model, the charged carrier effective mass formation is considered within the framework of the two-fluid scenario. The physical reasons of the normal fluid contribution divergency and the way of corresponding regularization procedure are discussed. Agreement between the theory and the available experimental data is found in a wide range of temperatures.