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

Workshop on Resonant Elastic X-ray Scattering in Condensed Matter 2013

Lim, J.A.^1 ; Blackburn, E.^1 ; Beutier, G.^2 ; Livet, F.^2 ; Magnani, N.^3 ; Bombardi, A.^4 ; Caciuffo, R.^3 ; Lander, G.H.^3

School of Physics and Astronomy, University of Birmingham, B15 2TT Birmingham, United Kingdom^1

SIMaP, CNRS Grenoble-INP-UJF, Saint-Martin-d'Hères, France^2

European Commission, Joint Research Centre, Institute for Transuranium Elements, Postfach 2340, D-76125 Karlsruhe, Germany^3

Diamond Light Source Ltd., Rutherford Appleton Laboratory, OX11 0QX, Oxfordshire, Didcot, United Kingdom^4

关键词: Antiferromagnetics;    Antiferromagnets;    Dynamical process;    Magnetic diffraction;    Magnetic dynamics;    Resonant x-ray diffraction;    Speckle contrasts;    X ray photon correlation spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/519/1/012010/pdf
DOI  :  10.1088/1742-6596/519/1/012010

来源: IOP

【 摘 要 】

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 ∼ 88%) and magnetic domains were observed; the number of domains increases on warming to T* ∼ 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 ∼ 0.4%) that increases in rate close to the transitions.