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We have investigated the diamagnetic response of composite NS proximitywires, consisting of a clean silver or copper coating, in good electricalcontact to a superconducting niobium or tantalum core. The samples show stronginduced diamagnetism in the normal layer, resulting in a nearly completeMeissner screening at low temperatures. The temperature dependence of thelinear diamagnetic susceptibility data is successfully described by thequasiclassical Eilenberger theory including elastic scattering characterised bya mean free path l. Using the mean free path as the only fit parameter we foundvalues of l in the range 0.1-1 of the normal metal layer thickness d_N, whichare in rough agreement with the ones obtained from residual resistivitymeasurements. The fits are satisfactory over the whole temperature rangebetween 5 mK and 7 K for values of d_N varying between 1.6 my m and 30 my m.Although a finite mean free path is necessary to correctly describe thetemperature dependence of the linear response diamagnetic susceptibility, themeasured breakdown fields in the nonlinear regime follow the temperature andthickness dependence given by the clean limit theory. However, there is adiscrepancy in the absolute values. We argue that in order to reachquantitative agreement one needs to take into account the mean free path fromthe fits of the linear response. [PACS numbers: 74.50.+r, 74.80.-g]Comment: 10 pages, 9 figure

Diamagnetic response of cylindrical normal-metal–superconductor proximity structures with low concentration of scattering centers