University of Oulu

Stupakov, A., Pacherova, O., Kocourek, T., Jelinek, M., Dejneka, A., & Tyunina, M. (2019). Negative magnetoresistance in epitaxial films of neodymium nickelate. Physical Review B, 99(8).

Negative magnetoresistance in epitaxial films of neodymium nickelate

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Author: Stupakov, A.1; Pacherova, O.1; Kocourek, T.1;
Organizations: 1Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic
2Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
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Language: English
Published: American Physical Society, 2019
Publish Date: 2019-05-13


A significant increase in conductivity under an applied magnetic field or large negative magnetoresistance up to several percent is observed at low temperatures in epitaxial perovskite NdNiO₃ films. The (20–100 nm) strained films are grown on compressive (001)LaAlO₃ and tensile (001)(La₀.₃Sr₀.₇)(Al₀.₆₅Ta₀.₃₅)O₃ substrates. The negative magnetoresistance is found in the insulating phase, where the hopping mechanism of conductivity is revealed. It is shown that the presence and Zeeman splitting of localized states are responsible for conductivity and magnetoresistance. The localized states are suggested to emerge due to thermally induced local disorder in the Ni-O bond disproportionation. Such disorder can also lead to a phase coexistence in a broad temperature range.

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Series: Physical review. B
ISSN: 2469-9950
ISSN-E: 2469-9969
ISSN-L: 2469-9950
Volume: 99
Issue: 8
Article number: 085111
DOI: 10.1103/PhysRevB.99.085111
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The work was supported in part by the European Structural and Investment Funds and Ministry of Education, Youth and Sports of the Czech Republic through Programme “Research, Development and Education” (Project No. SOLID21 CZ.02.1.01/0.0/0.0/16 019/0000760). Research facilities of the Center for Advanced Functional Materials (SAFMAT) and the Materials Growth and Measurement Laboratory (MGML) were employed in this work.
Copyright information: © 2019 American Physical Society. This is the author's version of the work. It is posted here for your personal use. Not for redistribution. The definitive Version of Record was published in Physical Review B 99:8,