Abstract
Anomalous resistive and magnetic behavior of GdOH thin films, which belong to the novel class of materials known as oxyhydrides, is reported. The oxyhydrides contain hydrogen in its rare negatively-charged anion state in combination with oxygen, which is also in the anion state. A range of GdOH films prepared on glass and single-crystalline substrates demonstrate a resistive transition from an insulating to conducting state with decrease of resistance starting as high as at about 200 K. At room temperature, the resistance per square area for the best GdOH films of the thickness of 200 nm is about 100 Ω, which is close to the resistance of the films of high-temperature superconductors of similar thickness. Apparent zero resistance is observed at about 40 K. Magneto-optical imaging registers effect of trapping magnetic flux typical for the superconducting state. The possible anion superconductivity is discussed in connection with recently published papers on near-room-temperature superconductivity in hydrides at high pressure and hydrogen-based superconductivity in biological systems.
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Acknowledgements
E. M. B and S. Z. K has received funding from M-ERA.net project “TESTIMONIES” from the Research Council of Norway.
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Mikheenko, P., Baba, E.M., Karazhanov, S. (2020). Electrical and Magnetic Behavior of GdOH Thin Films: A Search for Hydrogen Anion Superconductivity. In: Pogrebnjak, A., Bondar, O. (eds) Microstructure and Properties of Micro- and Nanoscale Materials, Films, and Coatings (NAP 2019). Springer Proceedings in Physics, vol 240. Springer, Singapore. https://doi.org/10.1007/978-981-15-1742-6_1
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DOI: https://doi.org/10.1007/978-981-15-1742-6_1
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