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Instruments / Technical Area	Publication Details	Published	Actions
I10-Beamline for Advanced Dichroism - scattering I16-Materials and Magnetism	Local magnetism, magnetic order and spin freezing in the "nonmetallic metal" FeCrAs Benjamin Huddart , Max T. Birch , Francis Pratt , Stephen Blundell , Dan. G. Porter , Stewart J. Clark , Wenlong Wu , Stephen R. Julian , Peter Hatton , Tom Lancaster Journal Of Physics: Condensed Matter DOI: 10.1088/1361-648X/ab151f Diamond Proposal Number(s): [15119] Show Abstract ▼ Abstract: We present the results of x-ray scattering and muon-spin relaxation (μ+SR) measurements on the iron-pnictide compound FeCrAs. Polarized non-resonant magnetic x-ray scattering results reveal the 120 periodicity expected from the suggested three-fold symmetric, non-collinear antiferromagnetic structure. μ+SR measurements indicate a magnetically ordered phase throughout the bulk of the material below T N=105(5) K. There are signs of fluctuating magnetism in a narrow range of temperatures above T N involving low-energy excitations, while at temperatures well below T N behaviour characteristic of freezing of dynamics is observed, likely reflecting the effect of disorder in our polycrystalline sample. Using density functional theory we propose a distinct muon stopping site in this compound and assess the degree of distortion induced by the implanted muon.	Apr 2019
I11-High Resolution Powder Diffraction I19-Small Molecule Single Crystal Diffraction	Origin of skyrmion lattice phase splitting in Zn-substituted Cu 2 OSeO 3 A. Stefancic , S. H. Moody , T. J. Hicken , M. T. Birch , G. Balakrishnan , S. A. Barnett , M. Crisanti , J. S. O. Evans , S. J. R. Holt , K. J. A. Franke , P. D. Hatton , B. M. Huddart , M. R. Lees , F. L. Pratt , C. C. Tang , M. N. Wilson , F. Xiao , T. Lancaster Physical Review Materials 2 DOI: 10.1103/PhysRevMaterials.2.111402 Show Abstract ▼ Abstract: We present an investigation into the structural and magnetic properties of Zn-substituted Cu2OSeO3, a system in which the skyrmion lattice (SkL) phase in the magnetic field–temperature phase diagram was previously seen to split as a function of increasing Zn concentration. We find that splitting of the SkL is only observed in polycrystalline samples and reflects the occurrence of several coexisting phases with different Zn content, each distinguished by different magnetic behavior. No such multiphase behavior is observed in single-crystal samples.	Nov 2018

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