Hopping conductance and macroscopic quantum tunneling effect in three dimensional Pb${}_x$(SiO${}_2$)${}_{1-x}$ nanogranular films

Xiu-Zhi Duan, Zhi-Hao He, Yang Yang +1

We have studied the low-temperature electrical transport properties of Pb${}_x$(SiO${}_2$)${}_{1-x}$ ($x$ being the Pb volume fraction) nanogranular films with thicknesses of $\sim$1000…