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The rare-earth nickelates possess a diverse set of collective phenomenaincluding metal-to-insulator transitions, magnetic phase transitions, and, uponchemical reduction, superconductivity. Here, we demonstrate epitaxialstabilization of layered nickelates in the Ruddlesden-Popper form,Nd$_{n+1}$Ni$_n$O$_{3n+1}$, using molecular beam epitaxy. By optimizing thestoichiometry of the parent perovskite NdNiO$_3$, we can reproduciblysynthesize the $n = 1 - 5$ member compounds. X-ray absorption spectroscopy atthe O $K$ and Ni $L$ edges indicate systematic changes in both thenickel-oxygen hybridization level and nominal nickel filling from 3$d^8$ to3$d^7$ as we move across the series from $n = 1$ to $n = \infty$. The $n = 3 -5$ compounds exhibit weakly hysteretic metal-to-insulator transitions withtransition temperatures that depress with increasing order toward NdNiO$_3$ ($n= \infty)$.

Synthesis and electronic properties of Nd$_{n+1}$Ni$_{n}$O$_{3n+1}$ Ruddlesden-Popper nickelate thin films