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Electronic and structural changes in SmNiO<sub>3</sub> perovskite under doping with hydrogen

ORAL

Abstract

Doping with hydrogen leads to formation of a new insulating phase in rare-earth nickelates, such as SmNiO3. High mobility of hydrogen atoms inside the perovskite crystal lattice allows one to change the distribution of hydrogen by applying short voltage pulses. The memory nano-devices based on this effect are promising candidates for creations of artificial synapses for neuromorphic computing.
We used nanofocused x-ray beam for spectroscopic and diffraction studies of the hydrogen-doped SmNiO3 film. We observed partial reduction of nickel valence due to addition of an extra electron from the dopant. We argue that the changes in electronic structure is mainly responsible for formation of the insulating phase, while the subtle changes in the crystal structure are not so significant. This allows one to use hydrogen and other light elements to create new phases in other complex transition metal oxides.

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Presenters

  • Ivan Zaluzhnyy

    University of California, San Diego, Department of Physics, University of California, San Diego

Authors

  • Ivan Zaluzhnyy

    University of California, San Diego, Department of Physics, University of California, San Diego

  • Peter Oliver Sprau

    University of California, San Diego, Advanced Development Center, ASML, Advanced Development Center, ASML; Laboratory of Atomic and Solid State Physics, Cornell University

  • Richard Tran

    University of California, San Diego

  • Qi Wang

    School of Materials Engineering, Purdue University

  • Hai-Tian Zhang

    School of Materials Engineering, Purdue University

  • Zhen Zhang

    School of Materials Engineering, Purdue University, West Lafayette, IN 47907, School of Materials Engineering, Purdue University

  • Nelson Hua

    University of California, San Diego, SLAC National Accelerator Laboratory

  • Boyan Stoychev

    University of California, San Diego

  • Mathew J Cherukara

    Center for nanoscale materials, Argonne National Laboratory

  • Martin Holt

    Center for nanoscale materials, Argonne National Laboratory, Argonne National Laboratory, Argonne National Lab

  • Evgeny Nazarertski

    National Synchrotron Light Source II, Brookhaven National Laboratory

  • Xiaojing Huang

    National Synchrotron Light Source II, Brookhaven National Laboratory, Brookhaven National Laboratory

  • Hanfei Yan

    National Synchrotron Light Source II, Brookhaven National Laboratory

  • Ajith Pattammattel

    National Synchrotron Light Source II, Brookhaven National Laboratory

  • Yong S. Chu

    National Synchrotron Light Source II, Brookhaven National Laboratory

  • Shyue Ping Ong

    University of California, San Diego

  • Shriram Ramanathan

    School of Materials Engineering, Purdue University, West Lafayette, IN 47907, School of Materials Engineering, Purdue University, Materials engineering, Purdue University

  • Oleg Shpyrko

    University of California, San Diego, Department of Physics, University of California, San Diego

  • Alex Frano

    University of California, San Diego, University of California San Diego, Department of Physics, University of California, San Diego