Анотація:
The density of states N(ε) of a mesoscopic cylindrical structure consisting of a normal pure metal and a
superconductor has been calculated using the Gorkov–Green functions. It is shown that magnetic fluxes of
certain values cause resonance spikes of N(ε) suggesting a large-amplitude paramagnetic contribution
which accounts for the reentrant effect detected (P. Visani, A.C. Mota, and A. Pollini, Phys. Rev. Lett. 65,
1514 (1990)).