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Whilst electron correlations were previously recognized to trigger beyondconventional direct current (DC) electronic transportations (e.g.metal-to-insulator transitions, bad metal, thermistors), their respectiveinfluences to the alternation current (AC) transport are largely overlooked.Herein, we demonstrate active regulations in the electronic functionalities ofd-band correlated rare-earth nickelate (ReNiO3) thin films, by simply utilizingtheir electronic responses to AC-frequencies (fAC). Assisted by temperaturedependent near edge X-ray absorption fine structure analysis, we discoveredpositive temperature dependences in Coulomb viscosity of ReNiO3 that moderatestheir AC impedance. Distinguished crosslinking among R(Real)-fAC measured innearby temperatures is observed that differs to conventional oxides. It enablesactive adjustability in correlated transports of ReNiO3, among NTCR-, TDelta-and PTCR- thermistors, via fAC from the electronic perspective without varyingmaterials or device structures. The TDelta-fAC relationship can be furtherwidely adjusted via Re composition and interfacial strains. The AC-frequencysensitivity discovered in ReNiO3 brings in a new freedom to regulating andswitching the device working states beyond the present semiconductortechnologies. It opens a new paradigm for enriching novel electronicapplications catering automatic transmission or artificial intelligence insensing temperatures and frequencies.

AC-frequency switchable correlated transports in rare-earth perovskite nickelates