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We report a detailed analysis of the electrical resistivity exponent of thinfilms of NdNiO3 as a function of epitaxial strain. Strain-free thin-films showa linear dependence of the resistivity vs temperature, consistent with aclassical Fermi gas ruled by electron-phonon interactions. In addition, theapparent temperature exponent, n, can be tuned with the epitaxial strainbetween n= 1 and n= 3. We discuss the critical role played by quenched randomdisorder in the value of n. Our work shows that the assignment ofFermi/Non-Fermi liquid behaviour based on experimentally obtained resistivityexponents requires an in-depth analysis of the degree of disorder in thematerial.

Tunable resistivity exponents in the metallic phase of epitaxial nickelates