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Instruments / Technical Area	Publication Details	Published	Actions
I21-Resonant Inelastic X-ray Scattering (RIXS)	Magnetic excitations in strained infinite-layer nickelate PrNiO2 films Qiang Gao , Shiyu Fan , Qisi Wang , Jiarui Li , Xiaolin Ren , Izabela Bialo , Annabella Drewanowski , Pascal Rothenbühler , Jaewon Choi , Ronny Sutarto , Yao Wang , Tao Xiang , Jiangping Hu , Ke-Jin Zhou , Valentina Bisogni , Riccardo Comin , Johan Chang , Jonathan Pelliciari , Xingjiang Zhou , Zhihai Zhu Nature Communications 15 DOI: 10.1038/s41467-024-49940-4 Diamond Proposal Number(s): [30189] Open Access Show Abstract ▼ Abstract: Strongly correlated materials respond sensitively to external perturbations such as strain, pressure, and doping. In the recently discovered superconducting infinite-layer nickelates, the superconducting transition temperature can be enhanced via only ~ 1% compressive strain-tuning with the root of such enhancement still being elusive. Using resonant inelastic x-ray scattering (RIXS), we investigate the magnetic excitations in infinite-layer PrNiO2 thin films grown on two different substrates, namely SrTiO3 (STO) and (LaAlO3)0.3(Sr2TaAlO6)0.7 (LSAT) enforcing different strain on the nickelates films. The magnon bandwidth of PrNiO2 shows only marginal response to strain-tuning, in sharp contrast to the enhancement of the superconducting transition temperature Tc in the doped superconducting samples. These results suggest the bandwidth of spin excitations of the parent compounds is similar under strain while Tc in the doped ones is not, and thus provide important empirics for the understanding of superconductivity in infinite-layer nickelates.	Jul 2024
I05-ARPES	Observation of a Van Hove singularity and implication for strong-coupling induced Cooper pairing in Delong Fang , Xun Shi , Zengyi Du , Pierre Richard , Huan Yang , X. X. Wu , Peng Zhang , Tian Qian , Xiaxin Ding , Zhenyu Wang , T. K. Kim , Moritz Hoesch , Aifeng Wang , Xianhui Chen , Jiangping Hu , Hong Ding , Hai-Hu Wen Physical Review B 92 (14) DOI: 10.1103/PhysRevB.92.144513 Show Abstract ▼ Abstract: Scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy have been investigated on single-crystal samples of KFe2As2. A Van Hove singularity (VHS) has been directly observed just a few meV below the Fermi level (EF) of superconducting KFe2As2, which locates in the middle of the principal axes of the first Brillouin zone. The majority of the density of states at EF, mainly contributed by the proximity effect of the saddle point to EF, is nongapped in the superconducting state. Our observation of the ungapped feature of the density of states due to the VHS points, while providing consistent explanations to many exotic behaviors previously observed in this material, suggests Cooper pairing induced by a strong-coupling mechanism.	Oct 2015

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