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We study the effect of morphology on the low temperature behavior ofsuperconducting nanowires of length $\approx$100 nm. A well-definedsuperconductor-insulator transition (SIT) is observed only in homogenous wires,in which case the transition occurs when the normal resistance is close to$h/4e^2$. Inhomogeneous wires, on the other hand, exhibit a mixed behavior,such that signatures of the superconducting and insulating regimes can beobserved in the same sample. The resistance versus temperature curves ofinhomogeneous wires show multiple steps, each corresponding to a weak linkconstriction (WLC) present in the wire. Similarly, each WLC generates adifferential resistance peak when the bias current reaches the critical currentof the WLC. Due to the presence of WLCs an inhomogeneous wire splits into asequence of weakly interacting segments where each segment can act as asuperconductor or as an insulator. Thus the entire wire then shows a mixedbehavior.Comment: 4 pages, 4 figures, 1 tabl

Effect of morphology on the superconductor-insulator transition in one-dimensional nanowires