THE SPECIFIC BEHAVIORS OF THE LOW-TEMPERATURE ELECTRICAL-RESISTIVITY OF PDHX

The residual resistivity of Pd H(x) is much larger for x < 1 compared to x > 0 which can be explained by the Coulomb potential of the Hydrogen interstitial sites. For x = 0.4 related to the mixture of the alpha and beta phases, drho/dT is much larger compared to the corresponding pure phases, a result which can be well explained by the percolation problem due to the geometrical correlations between the alpha and beta domains. But for thin films of thickness d less-than-or-equal-to 1000 angstrom, the variation of rho with d-1 is very similar for x = 0 and x = 0.8, a surprising result which can be explained by the corresponding electronic structures.