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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
B18-Core EXAFS I11-High Resolution Powder Diffraction I19-Small Molecule Single Crystal Diffraction	Soft chemical control of superconductivity in lithium iron selenide hydroxides Li1–xFex(OH)Fe1–ySe Hualei Sun , Daniel Woodruff , Simon Cassidy , Genevieve M. Allcroft , Stefan Sedlmaier , Amber Thompson , Paul Bingham , Susan D. Forder , Simon Cartenet , Nicolas Mary , Silvia Ramos , Francesca Foronda , Benjamin H. Williams , Xiaodong Li , Stephen J. Blundell , Simon J Clarke Inorganic Chemistry 54 (4) DOI: 10.1021/ic5028702 Diamond Proposal Number(s): [9697, 9981, 11061] Show Abstract ▼ Abstract: Hydrothermal synthesis is described of layered lithium iron selenide hydroxides Li1xFex(OH)Fe1ySe (x approx. 0.2; 0.02 < y < 0.15) with a wide range of iron site vacancy concentrations in the iron selenide layers. This iron vacancy concentration is revealed as the only significant compositional variable and as the key parameter controlling the crystal structure and the electronic properties. Single crystal X-ray diffraction, neutron powder diffraction, and X-ray absorption spectroscopy measurements are used to demonstrate that superconductivity at temperatures as high as 40 K is observed in the hydrothermally synthesized samples when the iron vacancy concentration is low (y < 0.05) and when the iron oxidation state is reduced slightly below +2, while samples with a higher vacancy concentration and a correspondingly higher iron oxidation state are not superconducting. The importance of combining a low iron oxidation state with a low vacancy concentration in the iron selenide layers is emphasized by the demonstration that reductive postsynthetic lithiation of the samples turns on superconductivity with critical temperatures exceeding 40 K by displacing iron atoms from the Li1xFex(OH) reservoir layer to fill vacancies in the selenide layer.	Jan 2015

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