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

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 diraction to focus on scattering at an antiferromagnetic Bragg peak. High quality coherent magnetic diraction 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.

LIM J. A.;  BLACKBURN E.;  BEUTIER G.;  LIVET F.;  MAGNANI Nicola;  BOMBARDI A.;  CACIUFFO Roberto;  LANDER G.H.; 

2014-08-04

INSTITUTE OF PHYSICS

JRC84793

1742-6588,   

http://iopscience.iop.org/1742-6596/519/1/012010/pdf/1742-6596_519_1_012010.pdf,    http://rexs2013.org/REXS2013/Proceedings.html,    http://iopscience.iop.org/1742-6596/519/1/012010,    https://publications.jrc.ec.europa.eu/repository/handle/JRC84793,   

10.1088/1742-6596/519/1/012010,