【直播】【北大量子材料科学中心】Resonant X-ray Scattering Study of Square……

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北大量子材料科学中心Resonant X-ray Scattering Study of Square-Planar Low-Valence Nickelates

2024年5月29日 15:00



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报告人简介



Yao Shen

Yao Shen received his B.S. and Ph.D. from Fudan University in 2013 and 2019, respectively, and worked as a postdoctoral research associate at Brookhaven National Laboratory in US afterwards. He joined the Institute of Physics, Chinese Academy of Sciences in 2023 as an associate professor. His research focuses on understanding the novel physical properties, and collective electronic and magnetic behaviors in various quantum materials using combined neutron and x-ray scattering techniques. So far, he has published more than 30 SCI papers including 1 Nature, 2 Nat. Commun., 2 PRX, and 2 PRL as a first author, and 2 Nat. Commun. and 1 PRL as a co-first author.
报告摘要

The discovery of superconductivity in square-planar low-valence nickelates has ignited a vigorous debate regarding their essential electronic properties: Do these materials have appreciable oxygen charge-transfer character and super-exchange akin to the cuprates or are they in a distinct Mott-Hubbard regime where oxygen plays a minimal role and super-exchange is negligible? Do they host charge order as cuprates and what is the electronic character of this symmetry breaking? Here, we resolve these questions using state-of-the-art resonant x-ray scattering measurements of the over-doped low-valance nickelates R₄Ni₃O₈ (R=La, Pr) and benchmark our results against a prototypical cuprate La₂₋ₓSrₓCuO₄ (x=0.35), which has a similar effective doping. We will discuss in detail their electronic structure, charge instability, magnetic interactions, plasmon behaviors, and electron-phonon coupling characters. By doing so, we are able to clarify the essential characteristics of low-valence nickelates and put strong constraints on theoretical interpretations of superconductivity in these materials.



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