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Instruments / Technical Area	Publication Details	Published
I21-Resonant Inelastic X-ray Scattering (RIXS)	Resonant inelastic x-ray spectroscopy on UO$_{2}$ as a test case for actinide materials G. H. Lander , Martin Sundermann , Ross Springell , Andrew Walters , Abhishek Nag , Mirian Garcia-Fernandez , Ke-Jin Zhou , Gerrit Van Der Laan , Roberto Caciuffo Journal Of Physics: Condensed Matter DOI: 10.1088/1361-648X/abc4d2 Diamond Proposal Number(s): [24583] Open Access Show Abstract ▼ Abstract: Resonant inelastic x-ray spectroscopy at the uranium $N_{4}$ absorption edge at 778 eV has been used to reveal the excitations in UO$_{2}$ up to 1 eV. The earlier (1989) studies by neutron inelastic scattering of the crystal-field states within the $^{3}H_{4}$ multiplet are confirmed. In addition, the first excited state of the $^{3}F_{2}$ multiplet at $\sim$520 meV has been established, and there is a weak signal corresponding to the next excited state at $\sim$920 meV. This represents a successful application of soft x-ray spectroscopy to an actinide sample, and resolves an open question in UO$_{2}$ that has been discussed for 50 years. The technique is described and important caveats are drawn about possible future applications.	Oct 2020
	Crystal-field states of UO2 probed by directional dependence of nonresonant inelastic x-ray scattering M. Sundermann , G. Van Der Laan , Andrea Severing , L. Simonelli , G. H. Lander , M. W. Haverkort , R. Caciuffo Physical Review B 98, 205108 DOI: 10.1103/PhysRevB.98.205108 Show Abstract ▼ Abstract: Nonresonant inelastic x-ray scattering (NIXS) has been performed on single crystals of UO2 to study the directional dependence of higher-order-multipole scattering from the uranium O4,5 edges (90-110 eV). By comparing the experimental results with theoretical calculations the symmetry of the ground state is confirmed directly as the crystal-field (CF) Γ5 triplet state within the J = 4 manifold. The results demonstrate that the directional dichroism of the NIXS spectra is sensitive to the CF strength and establish NIXS as a tool for probing CF interactions quantitatively.	Nov 2018
I10-Beamline for Advanced Dichroism	Tuning the hybridization and magnetic ground state of electron and hole doped CeOs 2 Al 10 : An x-ray spectroscopy study Kai Chen , Martin Sundermann , Fabio Strigari , Jo Kawabata , Toshiro Takabatake , Arata Tanaka , Peter Bencok , Fadi Choueikani , Andrea Severing Physical Review B 97 DOI: 10.1103/PhysRevB.97.155106 Diamond Proposal Number(s): [11558] Show Abstract ▼ Abstract: Here we present linear and circular polarized soft x-ray absorption spectroscopy (XAS) data at the Ce M4,5 edges of the electron (Ir) and hole-doped (Re) Kondo semiconductor CeOs2Al10. Both substitutions have a strong impact on the unusual high Néel temperature TN=28.5 K, and also the direction of the ordered moment in case of Ir. The substitution dependence of the linear dichroism is weak thus validating the crystal-field description of CeOs2Al10 being representative for the Re and Ir substituted compounds. The impact of electron and hole doping on the hybridization between conduction and 4f electrons is related to the amount of f0 in the ground state and reduction of x-ray magnetic circular dichroism. A relationship of cf-hybridization strength and enhanced TN is discussed. The direction and doping dependence of the circular dichroism strongly supports the idea of strong Kondo screening along the crystallographic a direction.	Apr 2018

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