Density of states in superconductor-normal metal-superconductor junctions

We consider the Chi sub(0)-dependence of the density of states inside the normal metal of a superconductor-normal metal-superconductor (SNS) junction. Here Chi sub(0) is the phase difference of two superconductors of the junction. It is shown that in the absence of electron-electron interaction the energy dependence of the density of states has a gap which decreases as Chi sub(0) increases and closes at Chi sub(0) identical with pi . Both the analytical expressions for the Chi sub(0)-dependence of the density of states and the results of numerical simulations are presented.