✍ Scribed by J.K.N. Sharma
No coin nor oath required. For personal study only.
In a previous paper the author presented the results of a detailed and systematic study of the thermal conductivities of ten very pure metal specimens. For four of the specimens measurements in both the normal and superconducting state were made. In this paper some of the superconducting state results are analysed and compared with current theory HEAT CONDUCTIVITIES BELOW 1 ° K. II J. K. N. SHARMAt I N the previous paper, the measurements on the thermal conductivity of gold, silver, palladium, platinum, nickel, tungsten, aluminium, tantalum, rhenium, and cadmium, below 1 ° K, using the helium-3 cryostat were described. ~ Of these the last four become superconductive and were measured both in the normal and in the superconductive states. In this paper we will present a detailed analysis of our superconductive state results on aluminium, tantalum, and rhenium, on the lines of the theory of thermal conductivity of superconductors (Bardeen, Rickayzen, and Tewordt) 2 which is based on the BCS theory of superconductivity. 3 The analysis will be used for estimating the value of the energy gap for each of these metals.
The thermal conductivity of superconductors just below their transition temperature is due to the scattering of electrons either by static imperfections, such as impurity atoms, lattice defects, etc., or by scattering from thermally excited lattice vibrations. Bardeen, Rickayzen, and Tewordt 2 (referred to hereafter as BRT)
📜 SIMILAR VOLUMES