INSULATING MODIFICATION IN COLD DEPOSITED FILMS OF LEAD

We present an experimental study of cold deposited Pb films. Experimen tal results show that high values of the film thickness corresponding to the onset of electrical conductivity (55-65 Angstrom) cannot be exp lained by the formation of the island structure. It means that metasta ble insulating modification of Pb is formed in this case. All the resu lts are in good agreement with the recently proposed model of the insu lating modifications of metals [I. A. Parshin et al., Phys. Rev. B 54, 1308 (1996) and A. V. Danilov et al., J. of Low Temp. Phys. 103, 35 ( 1996)].