Galvanomagnetic properties of metals at boiling of liquid helium

Abstract

Galvanomagnetic properties of metals at boiling point of liquid helium and some problems relating to Joule heating in cylinder conductors are investigated by the method of voltage current characteristics. Radial current under an external coaxial magnetic field is used to get high magnetoresistance of conductor. High level of magnetoresistance in this geometry offers the possibility to investigate a wide range of heat generation. The stabilization of voltage observed in definite current range is discussed in terms of analysis of heat aspects of problem when a heat generation function and heat elimination they are regarded at helium temperature. An electric temperature ordering of system is proposed as a factor for voltage stabilization when the presence of more heated and less heated sections along conductor radius is connected with negativity of derivative of heat elimination function with respect to temperature between first and second boiling crisis.