Presentation Information
[2P47]Evaluating the roles of hydrogen and oxygen in the hydrogen-induced insulator transition of rare-earth nickelates using in situ NRA/TDS
*Ikuya Matsuzawa1, Takahiro Ozawa1, Hidekazu Tanaka2, Azusa Hattori2, Katsuyuki Fukutani1,3 (1. Institute of Industrial Science, the University of Tokyo, 2. SANKEN, The University of Osaka, 3. Japan Atomic Energy Agency)
To clarify the mechanism of the giant resistivity increase in hydrogenated rare-earth nickelates (ReNiO3), we investigated the distinct roles of hydrogen and oxygen content. We performed in situ experiments on epitaxial ReNiO3 thin films, combining hydrogenation, electrical resistivity measurement, Nuclear Reaction Analysis (NRA), and Thermal Desorption Spectroscopy (TDS) in a single UHV chamber. This approach enabled real-time tracking of resistivity changes correlated with hydrogen and oxygen content during thermal desorption. Complementary XRD and post-annealing tests were also conducted to evaluate the lattice structure and the effect of oxygen replenishment. Our results allow for a comprehensive discussion of how hydrogen and oxygen content, along with lattice structure, cooperatively induce the dramatic change in the electronic properties of ReNiO3.