High-temperature resistivity in rare-earth nickelates films

0575694 - FZÚ 2024 RIV NL eng J - Journal Article
Stupakov, Alexandr - Kocourek, Tomáš - de Prado, Esther - More Chevalier, Joris - Vetokhina, Volha - Dejneka, Alexandr - Tyunina, Marina
High-temperature resistivity in rare-earth nickelates films.
Journal of Magnetism and Magnetic Materials. Roč. 587, Dec. (2023), č. článku 171256. ISSN 0304-8853. E-ISSN 1873-4766
R&D Projects: GA ČR(CZ) GA20-21864S; GA MŠMT LM2023065
Institutional support: RVO:68378271
Keywords : rare-earth nickelate * perovskite oxide * hopping conductivity * small polaron * metal–insulator transition
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 2.7, year: 2022
Method of publishing: Open access with time embargo
https://doi.org/10.1016/j.jmmm.2023.171256

We expand the temperature interval of the resistivity measurement to clarify the charge transport mechanisms in the rare-earth nickelates ReNiO3. Thin films of LaNiO3 demonstrate an expected metallic behavior at high temperatures: a perfect linear rise of the resistivity with temperature is confirmed. However, NdNiO3 films characterized by a sharp metal-to-insulator transition display a noticeable deviation of their high-temperature resistivity from the metallic linear relation. This deviation is suggested to originate from an additional thermally activated hopping transport. High-temperature hopping conductivity is also found in SmNiO3 films. Carrier localization due to disorder and the formation of small polarons is discussed as being responsible for hopping.
Permanent Link: https://hdl.handle.net/11104/0345432