Tunable resistivity exponents in the metallic phase of epitaxial nickelates

Qikai Guo (), Saeedeh Farokhipoor, César Magén, Francisco Rivadulla and Beatriz Noheda ()
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Qikai Guo: University of Groningen
Saeedeh Farokhipoor: University of Groningen
César Magén: Universidad de Zaragoza-CSIC
Francisco Rivadulla: Universidade de Santiago de Compostela
Beatriz Noheda: University of Groningen

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract We report a detailed analysis of the electrical resistivity exponent of thin films of NdNiO3 as a function of epitaxial strain. Thin films under low strain conditions show a linear dependence of the resistivity versus temperature, consistent with a classical Fermi gas ruled by electron-phonon interactions. In addition, the apparent temperature exponent, n, can be tuned with the epitaxial strain between n = 1 and n = 3. We discuss the critical role played by quenched random disorder in the value of n. Our work shows that the assignment of Fermi/Non-Fermi liquid behaviour based on experimentally obtained resistivity exponents requires an in-depth analysis of the degree of disorder in the material.

Date: 2020
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DOI: 10.1038/s41467-020-16740-5

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