Electrical Properties of Periodic Pd/Mo Bimetal Films

The electrical resistivity and the temperature coefficient of resistance (TCR) of periodic Pd/Mo bimetal films are reported for the bilayer wavelength in the range 1.5-13nm by varying the ratio of Pd and Mo thicknesses in the temperature range from 77 to 300K. The resistivity is found to be nearly proportional to the inverse of the bilayer wavelength. The most striking feature is that the TCR is decreased with bilayer wavelength and the change in sign of the TCR as Pd/Mo thickness ratio is varied. Taking into account the effects of electron weak localization in Mo layer, the experimental results can be explained.