On the critical temperature of a superconducting system

Abstract

Based on the assumption that in the groundbcs state the net gain in energy is equivalent to the repulsive electron-ion and electron-electron Darwin interactions, an expression forTc has been obtained which depends on only a few atomic parameters. The theory provides a criterion for the occurrence of superconductivity and yields satisfactory values ofTc for metals and alloys, and ternary chalcogenides and borides. It explains the difference inTc in the crystalline and amorphous states as well as the pressure dependence ofTc. The possibility of occurrence of high temperature superconductivity has been explored.