Nanostructure Investigations of Nonlinear Differential Conductance in NdNiO${}_3$ Thin Films

Abstract

Transport measurements on thin films of NdNiO${}_3$ reveal a crossover to a regime of pronounced nonlinear conduction below the well-known metal-insulator transition temperature. The evolution of the transport properties at temperatures well below this transition appears consistent with a gradual formation of a gap in the hole-like Fermi surface of this strongly correlated system. As $T$ is decreased below the nominal transition temperature, transport becomes increasily non-Ohmic, with a model of Landau-Zener breakdown becoming most suited for describing $I(V)$ characteristics as the temperature approaches 2~K.

arXiv comment18 pages, 6 figures, accepted for publication in PRB

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