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Instruments / Technical Area	Publication Details	Published
I16-Materials and Magnetism	Ordering fluctuation dynamics in AuAgZn_2 Frederic Livet , Mathieu Fèvre , Guillaume Beutier , Mark Sutton Physical Review B 92 (9), 094102 DOI: 10.1103/PhysRevB.92.094102 Diamond Proposal Number(s): [630] Show Abstract ▼ Abstract: The second-order ordering transition of the AuAgZn2 alloy has been studied by coherent x-ray scattering. Within a few degrees above the critical temperature Tc, equilibrium critical fluctuations are observed together with some pretransitional local ordering connected to sample defects. The speckles observed correspond to heterodyne interference between local ordering and fluctuations and show a mixed static and dynamical behavior in a narrow domain of a few tenths of degree above Tc. The dynamical behavior is shown to correspond to the critical slowing down of the fluctuations in the vicinity of the transition (model “A” of Hohenberg and Halperin [Rev. Mod. Phys. 49, 435 (1977)]). A rough comparison can be carried out with the classical diffusion models. Some improvements of the method are discussed.	Sep 2015
I16-Materials and Magnetism	Coherent magnetic diffraction from the uranium M4 edge in the multi-k magnet, USb J. Lim , E. Blackburn , G. Beutier , F. Livet , N. Magnani , A. Bombardi , R. Caciuffo , G. H. Lander Journal Of Physics: Conference Series 519 REXS 2013 — Workshop on Resonant Elastic X-ray Scattering in Condensed Matter DOI: 10.1088/1742-6596/519/1/012010 Diamond Proposal Number(s): [8384] Open Access Show Abstract ▼ Abstract: The slow magnetic dynamics, from seconds to kiloseconds, of the canonical 3-k antiferromagnet USb have been probed, using X-ray photon correlation spectroscopy (XPCS). In this work, XPCS is combined with resonant X-ray diffraction to focus on scattering at an antiferromagnetic Bragg peak. High quality coherent magnetic diffraction patterns were recorded (speckle contrast of about 88%) and magnetic domains were observed; the number of domains increases on warming to T* about 160 K, where the spin waves soften to zero frequency, and again on warming to TN = 218 K. The intensity auto-correlation, g2(t), is primarily static over 1000 s, with a small dynamical process (change of about 0.4%) that increases in rate close to the transitions.	May 2014
NONE-No attached Diamond beamline	Back-illuminated CCD for coherent soft x-ray imaging A. Marty , F. Livet , G. Beutier , G. Van Der Laan European Physical Journal Applied Physics 42 (2), 161-167 DOI: 10.1051/epjap:2008044 Show Abstract ▼ Abstract: Direct-illumination CCDs find increasing use in coherent X-ray imaging due to their good spatial resolution and signal-to-noise ratio. These CCDs offer a high quantum efficiency for soft X-rays near the 3d transition metal L edges. We compare front- and back-illuminated CCDs and describe a method to obtain images with a large dynamic range (five orders of magnitude) and high spatial resolution. Back-illuminated CCDs are resistant to radiation damage at the soft X-ray energies and provide a true 13.5 ?m pixel resolution. High quality diffraction images are obtained in magnetic studies from metallic multilayer structures in reflection geometry.	Mar 2008
	Soft x-ray coherent scattering: Instrument and methods at ESRF ID08 Guillaume Beutier , Alain Marty , Freìdeìric Livet , Gerrit Van Der Laan , Stefan Stanescu , Peter Bencok Review Of Scientific Instruments 78 (9) DOI: 10.1063/1.2779218 Show Abstract ▼ Abstract: An experimental setup has been developed to perform soft x-ray coherent scattering at beamline ID08 of the European Synchrotron Radiation Facility. An intense coherent beam was obtained by filtering the primary beam with the monochromator and a circular pinhole. A pinhole holder with motorized translations was installed inside the UHV chamber of the diffractometer. The scattered intensity was recorded in reflection geometry with a back-illuminated charge coupled device camera. As a demonstration we report experimental results of resonant magnetic scattering using coherent beam. The degree of coherence is evaluated, and it is shown that, while the vertical coherence is much higher than the horizontal one at the source, the situation is reversed at the diffractometer. The intensity of the coherent beam is also discussed.	Sep 2007

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