THE FORMULATION BETWEEN PENETRATION DEPTH AND CRITICAL TEMPERATURE OF SUPERCONDUCTORS BY THERMAL PHYSICS AND ELECTROMAGNETIC THEORY.

Several phenomena associated with superconductivity are expressed in terms of concentration of superconducting electrons, penetration depth and temperature etc. The empirical relation for the density of superconducting electrons and the relation in terms of penetration depth are discussed in the present paper. These empirical relations are obtained on the basis of experimental data. These relations are derived mathematically on the basis of thermodynamically and electro dynamically properties with interaction between superconducting electrons and phonons.