https://doi.org/10.1140/epjs/s11734-025-01491-5
Regular Article
Anomalous magnetoresistance in zirconium oxynitrides thin films for cryogenic temperature sensors in high-field superconducting magnets
1
Key Laboratory of Cryogenic Science and Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 100190, Beijing, China
2
School of Future Technology, University of Chinese Academy of Sciences, 101408, Beijing, China
a
hanym@mail.ipc.ac.cn
b
huangrongjin@mail.ipc.ac.cn
Received:
21
August
2024
Accepted:
26
January
2025
Published online:
3
February
2025
Accurate cryogenic temperature measurement in strong magnetic fields is essential for both fundamental research and the operation of superconducting magnets in large-scale scientific facilities. However, magnetoresistance can lead to deviations in temperature readings from resistance thermometers. In this study, we investigated ZrNxOy-sputtered films with varying nitrogen content, observing both positive saturated and negative magnetoresistance behaviors across different magnetic field strengths in strong localized systems. At low temperatures, the electrical transport data revealed that conduction is governed by Mott’s variable range hopping, with samples exhibiting stronger localization transitioning to Efros–Shklovskii variable range hopping. Angle-dependent measurements further confirmed the isotropic nature of magnetoresistance in these films. The observed positive magnetoresistance, from – 2 T to 9 T, is attributed to spin-related multiple exchange–correlation effects, while the negative magnetoresistance is associated with spin flip scattering. It can support the development of strong localized-based thermometers for accurate temperature monitoring in high magnetic field environments generated by superconducting magnets.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.