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Vilas Pol, a Purdue associate professor of chemical engineering and materials engineering, and Purdue graduate student Dawgen Lim. The research findings demonstrated behavior related to the "Mott transition," a quantum mechanical effect describing how the addition of electrons can change the conducting behavior of a material. "As we add more electrons to the system the material becomes less and less conducting, which makes it a very interesting system to study, and this effect can only be explained through quantum mechanics," Ramanathan said. Kotiuga's contribution to the work was to study the electronic properties of lithium-doped samarium nickelate as well as the changes to the crystal structure after doping. "My calculations show that undoped samarium nickelate is a narrow-gapped semiconductor, meaning that even though it is not metallic, electrons can be excited into a conducting state without too much trouble," she said. "As lithium is added to samarium nickelate the lithium ion will bind to an oxygen and an electron localizes on a nearby nickel-oxygen octahedron, and when an electron has localized on every nickel-oxygen octahedron the material is converted into an insulator. This is a rather counterintuitive result: the added electrons to the system make the material more insulating." The material's crystal structure was characterized using a synchrotron-radiation light source research facility at Argonne National Laboratory. The researchers had been working on the paper for about two years and plan to further explore the material's quantum behavior and potential applications in brain-inspired computing. More information: Yifei Sun et al. Strongly correlated perovskite lithium ion shuttles, Proceedings of the National Academy of Sciences (2018). DOI: 10.1073/pnas.1805029115 Provided by Purdue University 2/ 3PDF Image | Quantum material is promising ion conductor
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