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Coherent magnetic diffraction from the uranium M4 edge in the multi-k magnet, USb

DOI: 10.1088/1742-6596/519/1/012010 DOI Help

Authors: J. Lim (University of Birmingham, U.K.) , E. Blackburn (University of Birmingham, U.K.) , G. Beutier (CEA, INAC, France) , F. Livet (UMR CNRS 526) , N. Magnani (European Commission, Joint Research Centre, Institute for Transuranium Elements, Germany) , A. Bombardi (Diamond Light Source) , R. Caciuffo (I.T.U.-JRC, Germany) , G. H. Lander (European Commission, Joint Research Centre, Institute for Transuranium Elements, Germany)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics: Conference Series , VOL 519

State: Published (Approved)
Published: May 2014
Diamond Proposal Number(s): 8384

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.

Journal Keywords: Antiferromagnetism; Antimonides; Bragg Curve; Bragg Reflection; Correlations; Photons; Probes; Spin Waves; Temperature Dependence; Uranium; Uranium Compounds; X Radiation; X-Ray Diffraction; X-Ray Spectroscopy

Subject Areas: Physics

Instruments: I16-Materials and Magnetism