Hopping nature of the Hall effect in a samarium nickelate film
Stupakov, Alexandr; Kocourek, Tomáš; Pacherová, Oliva; Suchaneck, Gunnar; Dejneka, Alexandr; Tyunina, Marina (2024-03-04)
American institute of physics
04.03.2024
Alexandr Stupakov, Tomáš Kocourek, Oliva Pacherová, Gunnar Suchaneck, Alexandr Dejneka, Marina Tyunina; Hopping nature of the Hall effect in a samarium nickelate film. Appl. Phys. Lett. 4 March 2024; 124 (10): 102103. https://doi.org/10.1063/5.0198307
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© 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
© 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202403132203
https://urn.fi/URN:NBN:fi:oulu-202403132203
Tiivistelmä
Abstract
We analyzed the temperature dependencies of the DC resistivity and Hall coefficient in thin films of samarium nickelate SmNiO3. A dominating hopping conductivity was revealed in the insulating phase below 400 K, which defines an exponential drop in the Hall coefficient with temperature. The estimated dependencies of the hopping activation energy, Hall mobility, and charge carrier density suggest that small polarons are responsible for hopping. The hopping transport explains the observed sign anomaly of the Hall coefficient in rare-earth nickelates.
We analyzed the temperature dependencies of the DC resistivity and Hall coefficient in thin films of samarium nickelate SmNiO3. A dominating hopping conductivity was revealed in the insulating phase below 400 K, which defines an exponential drop in the Hall coefficient with temperature. The estimated dependencies of the hopping activation energy, Hall mobility, and charge carrier density suggest that small polarons are responsible for hopping. The hopping transport explains the observed sign anomaly of the Hall coefficient in rare-earth nickelates.
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