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Instruments / Technical Area	Publication Details	Published	Actions
I21-Resonant Inelastic X-ray Scattering (RIXS)	Electronic and magnetic excitations in La3Ni2O7 Xiaoyang Chen , Jaewon Choi , Zhicheng Jiang , Jiong Mei , Kun Jiang , Jie Li , Stefano Agrestini , Mirian Garcia-Fernandez , Hualei Sun , Xing Huang , Dawei Shen , Meng Wang , Jiangping Hu , Yi Lu , Ke-Jin Zhou , Donglai Feng Nature Communications 15 DOI: 10.1038/s41467-024-53863-5 Diamond Proposal Number(s): [35805] Open Access Show Abstract ▼ Abstract: High-temperature superconductivity was discovered in the pressurized nickelate La3Ni2O7 which has a unique bilayer structure and mixed valence state of nickel. The properties at ambient pressure contain crucial information of the fundamental interactions and bosons mediating superconducting pairing. Here, using X-ray absorption spectroscopy and resonant inelastic X-ray scattering, we identified that Ni 3, Ni 3, and ligand oxygen 2p orbitals dominate the low-energy physics with a small charge-transfer energy. Well-defined optical-like magnetic excitations soften into quasi-static spin-density-wave ordering, evidencing the strong electronic correlation and rich magnetic properties. Based on an effective Heisenberg spin model, we extract a much stronger inter-layer effective magnetic superexchange than the intra-layer ones and propose two viable magnetic structures. Our findings emphasize that the Ni 3 orbital bonding within the bilayer induces novel electronic and magnetic excitations, setting the stage for further exploration of La3Ni2O7 superconductor.	Nov 2024
I21-Resonant Inelastic X-ray Scattering (RIXS)	Evolution of spin excitations from bulk to monolayer FeSe Jonathan Pelliciari , Seher Karakuzu , Qi Song , Riccardo Arpaia , Abhishek Nag , Matteo Rossi , Jiemin Li , Tianlun Yu , Xiaoyang Chen , Rui Peng , Mirian Garcia-Fernandez , Andrew C. Walters , Qisi Wang , Jun Zhao , Giacomo Ghiringhelli , Donglai Feng , Thomas A. Maier , Ke-Jin Zhou , Steven Johnston , Riccardo Comin Nature Communications 12 DOI: 10.1038/s41467-021-23317-3 Diamond Proposal Number(s): [18883] Open Access Show Abstract ▼ Abstract: In ultrathin films of FeSe grown on SrTiO3 (FeSe/STO), the superconducting transition temperature Tc is increased by almost an order of magnitude, raising questions on the pairing mechanism. As in other superconductors, antiferromagnetic spin fluctuations have been proposed to mediate SC making it essential to study the evolution of the spin dynamics of FeSe from the bulk to the ultrathin limit. Here, we investigate the spin excitations in bulk and monolayer FeSe/STO using resonant inelastic x-ray scattering (RIXS) and quantum Monte Carlo (QMC) calculations. Despite the absence of long-range magnetic order, bulk FeSe displays dispersive magnetic excitations reminiscent of other Fe-pnictides. Conversely, the spin excitations in FeSe/STO are gapped, dispersionless, and significantly hardened relative to its bulk counterpart. By comparing our RIXS results with simulations of a bilayer Hubbard model, we connect the evolution of the spin excitations to the Fermiology of the two systems revealing a remarkable reconfiguration of spin excitations in FeSe/STO, essential to understand the role of spin fluctuations in the pairing mechanism.	May 2021

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