Yn. Ovchinnikov et al., TEMPERATURE AND MAGNETIC-FIELD DEPENDENCE OF THE INDUCED MAGNETIZATION IN MACROSCOPIC SAMPLES DUE TO THE PROXIMITY EFFECT, Physical review. B, Condensed matter, 56(14), 1997, pp. 9038-9051
We have applied the Ginzburg-Landau equations to calculate the behavio
r of the diamagnetism of macroscopic samples consisting of a normal me
tal in contact with a superconductor. In particular, the calculation f
ocuses on the temperature region above the superconductive transition
temperature T-cN Of the normal metal. We have compared these calculati
ons with experimental measurements of the temperature (0.006-1 K) and
magnetic field (10(-9)-10(-6) T) dependence of the diamgetism for seve
ral samples of Be (T(cN)similar to 23 mK) and W (T(cN)similar to 15.5
mK) in contact with the superconductor Al (T-cS= 1.18 K). The agreemen
t between the predictions and measurements is quite good and confirms
the approach of using the Ginzburg-Landau model to calculate the proxi
mity effect in macroscopic normal systems above their superconductive
transitions.