报告摘要:

More than 35 years after the discovery of non-conventional superconductivity in layered cuprates, a consistent picture of their special behavior is still missing. Experimental observations and theoretical hypotheses have been accumulating over the years, with scant advances in terms of clear-cut simplifications. The reason for that is in the deep entwining of charge, spin and lattice degrees of freedom that govern cuprates. In the last decade, resonant x-ray scattering (elastic and, mostly, inelastic, ie RIXS) has been providing observations helpful for the simplification of the picture. RIXS is especially well suited to study strongly correlated materials because it can probe all categories of excitations, ie charge, orbital, lattice and spin, and mixed ones. The energy of orbital (dd) and spin (magnon) excitations were definitely assessed by RIXS in parent compounds and in superconductors. And subtle properties of their nature can be now unveiled [1,2]. RIXS can also measure electron-phonon coupling in cuprates, and has revealed elusive charge order and associated fluctuations that are mixed with lattice modes [3]. Moreover, RIXS can detect the opening of the superconducting gap and of the pseudogap in YBCO [4]. Superconducting infinite-layer nickleates, the closest analogues of cuprates, are also being studied with RIXS very successfully [5]. I will provide an overview of the recent results on cuprates and nickelates obtained by our group, with an outlook to the new opportunities available at XFELs with time-resolved RIXS.

[1] Martinelli, L. et al,. Physical Review Letters, 132(6), 066004 (2024)

[2] Martinelli, L.et al., Phys. Rev. X, 12, 021041 (2022),

[3] Arpaia, R. et al., Nature Communications, 14, 7198 (2023)

[4] Merzoni, G. et al., Phys. Rev. B 109, 184506 (2024)

[5] F. Rosa et al.,arXiv:2406.09271

报告人简介：

Giacomo Ghiringhelli于2001年获得法国格勒诺布尔约瑟夫-傅里叶大学物理学博士学位。此后，他一直在意大利米兰理工大学物理系任教，自2017年起担任正教授。他是欧洲同步加速器（ESRF）的用户和访问科学家。他通过设计高分辨率光谱仪（瑞士光源的SAXES、ESRF的ERIXS、欧洲XFEL的hRIXS）及其创新利用，领导了软X射线共振非弹性X射线散射谱仪（RIXS）的发展；2018年，他与Lucio Braicovich一起获得了欧洲物理学会凝聚态物理分会的欧洲物理学奖。他是意大利科学院（Accademia dei Lincei）和欧洲科学院（Academia Europaea）的会员。2022年，他还获得了卡默林赫-昂内斯超导奖。自2022年起，他担任ESRF科学顾问委员会主席。他的科研兴趣包括通过共振X射线散射和X射线吸收光谱研究高温超导体和其他量子材料的磁性和电子特性。

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