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A series of Ruddlesden-Popper nickelates, Nd$_{n+1}$Ni$_{n}$O$_{3n+1}$ (${n}$= 1-5), have been stabilized in thin film form using reactive molecular-beamepitaxy. High crystalline quality has been verified by X-ray diffraction andscanning transmission electron microscopy. X-ray photoelectron spectroscopyindicates the ${n}$-dependent valence states of nickel in these compounds.Metal-insulator transitions show clear ${n}$ dependence for intermediatemembers (${n}$ = 3-5), and the low-temperature resistivities of which showlogarithmic dependence, resembling the Kondo-scattering as observed in theparent compounds of superconducting infinite-layer nickelates.

Epitaxial growth of Ruddlesden-Popper neodymium nickelates Nd$_{n+1}$Ni$_{n}$O$_{3n+1}$ (${n}$ = 1-5)