Search Results

You searched for all publications:

with publication states 'Published (Approved)'

Search Again...

These results only include publications that have been reviewed and processed by Diamond Light Source. To also view papers that have not yet been processed click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

Exact matches
Related results

3 items found (0 items not approved), displaying all items.1

Instruments / Technical Area	Publication Details	Published
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	Cationic and anionic dual redox activity of MoS2 for electrochemical potassium storage Ajay Piriya Vijaya Kumar Saroja , Yupei Han , Charlie A. F. Nason , Gopinathan Sankar , Pan He , Yi Lu , Henry R. Tinker , Andrew Stewart , Veronica Celorrio , Min Zhou , Jiayan Luo , Yang Xu Acs Materials Letters DOI: 10.1021/acsmaterialslett.4c01455 Diamond Proposal Number(s): [30102] Open Access Show Abstract ▼ Abstract: MoS2 is regarded as one of the most promising potassium-ion battery (PIB) anodes. Despite the great progress to enhance its electrochemical performance, understanding of the electrochemical mechanism to store K-ions in MoS2 remains unclear. This work reports that the K storage process in MoS2 follows a complex reaction pathway involving the conversion reactions of Mo and S, showing both cationic redox activity of Mo and anionic redox activity of S. The presence of dual redox activity, characterized in-depth through synchrotron X-ray absorption, X-ray photoelectron, Raman, and UV–vis spectroscopies, reveals that the irreversible Mo oxidation during the depotassiation process directs the reaction pathway toward S oxidation, which leads to the occurrence of K–S electrochemistry in the (de)potassiation process. Moreover, the dual reaction pathway can be adjusted by controlling the discharge depth at different cycling stages of MoS2, realizing a long-term stable cycle life of MoS2 as a PIB anode.	Oct 2024
I21-Resonant Inelastic X-ray Scattering (RIXS)	Evolution of orbital excitations from insulating to superconducting MgTi2O4 films Qizhi Li , Abhishek Nag , Xiquan Zheng , Fucong Chen , Jie Yuan , Kui Jin , Yi Lu , Ke-Jin Zhou , Yingying Peng Physical Review B 107 DOI: 10.1103/PhysRevB.107.L121108 Show Abstract ▼ Abstract: Spinel oxides are well-known functional materials but rarely show superconductivity. Recently, emergent superconductivity was discovered in MgTi 2 O 4 , which is attributed to the increase of electron doping and the suppression of orbital order. Here, we utilized Ti L -edge resonant inelastic x-ray scattering to study the orbital excitations in superconducting (SC) and insulating MgTi 2 O 4 films. We find that the spectral weight of orbital excitations is enhanced and the energy of t 2 g intraband excitation is softened in the SC film compared to the insulating one, suggesting higher electron doping and a suppressed orbital order gap in the SC sample. These observations were further supported by our multiplet calculations using the minimal two-site model. Our results provide spectroscopic evidence for the competition between orbital order and superconductivity in MgTi 2 O 4 and shed light on searching for novel superconductors in spinel oxides.	Mar 2023

Publications Database

Search Results

You searched for all publications:

Search Again...

Subject Areas (check all that apply) select all

Instruments used to collect data (check all that apply) select all

Collaborations involved (check all that apply) select all

Diamond Offline Facilities used

Relevant Technical Areas (check all that apply) select all

Menu for Anonymous User