Heavily oxygen deficient NdNiO3 (NNO) films, which are insulating due to electron localization, contain pristine regions that undergo a hidden metal-insulator transition. Increasing oxygen content increases the connectivity of the metallic regions and the metal-insulator transition is first revealed, upon reaching the percolation threshold, by the presence of hysteresis. Only upon further oxygenation is the global metallic state (with a change in the resistivity slope) eventually achieved. It is shown that sufficient oxygenation leads to linear temperature dependence of resistivity in the metallic state, with a scattering rate directly proportional to temperature. These results could provide experimental support for recent theoretical predictions of disorder in a two-fluid model as a possible origin of Planckian dissipation.

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Data repository contains electrical transport and conducting AFM experimental data and their analysis presented in the paper: Guo, Q., Noheda, B. From hidden metal-insulator transition to Planckian-like dissipation by tuning the oxygen content in a nickelate. npj Quantum Mater. 6, 72 (2021). ************ Directories in data repository are structured according Figures in publication. The raw data of Figure 1 were displayed in separated text files named with corresponding temperature. Data of other figures were named as "Data of Figure XXX". *********** A pdf file named as “Overall description of the database_read me first” describes the overall directory of this database, including the physical meaning of each parameters and explanations about how the data are analyzed. **************A majority of data included are collected with a Quantum Design Physical properties measurement system (PPMS) system in group Nanostructure of functional oxides. The conducting AFM is performed in a Bruker ICON system and the data were analyzed in NanoScope Analysis version 1.9.