Epitaxial growth and superconducting-transition-temperature anomalies of Mo/V superlattices

We have epitaxially grown by magnetron sputtering Mo/V superlattices in two different crystalline orientations, (001) and (110), which are determined by our choice of substrate. We have measured $T_c$ as a function of chemical modulation wavelength Λ and find that the behavior cannot be explained by application of proximity-effect theories. We also observe an orientational dependence of $T_c$ which can be understood by effectively rescaling Λ into the number of atomic planes of vanadium in one multilayer period.