doi:10.1016/j.ssc.2004.06.026 
Copyright © 2004 Elsevier Ltd All rights reserved.
High-energy non-resonant X-ray magnetic scattering from EuAs3
Tapan Chatterjia, b, 
, 
, K.D. Lißc, T. Tschentscherc, B. Janossyd, J. Strempfere and T. Brückele
aInstitut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France
bMax-Planck-Institut für Physik Komplexer Systeme, Nöthnizerstrasse 32, D-01187 Dresden, Germany
cEuropean Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France
dEcole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
eHASYLAB, DESY, Notkestrasse 85, D-22603 Hamburg, Germany
Received 30 April 2004;
accepted 14 June 2004.
by C. Lacroix.
Available online 14 July 2004.
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Abstract
We have investigated non-resonant high energy X-ray magnetic scattering from EuAs3 both in the antiferromagnetic and in the incommensurate phase by using an X-ray energy of 104 and 106 keV. In the antiferromagnetic phase, we obtained a signal to background ratio of about 10:1 for the magnetic Bragg peak at Q=(−1,0,1/2) and a maximum count rate of about 200 counts/s at T=3.1 K. To our knowledge this is the first reported observation of the non-resonant magnetic signal from a rare-earth ion at X-ray energy as high as 106 keV. The temperature dependence of the integrated intensity of the (−1,0,1/2); magnetic reflection has been measured and compared with that obtained previously by neutron diffraction. We measured the integrated intensities of several magnetic reflections from the antiferromagnetic phase and have compared them with those calculated from the magnetic structure model derived from neutron diffraction. The intensities of the magnetic satellite reflections from the incommensurate phase have been measured and have been found to be very weak. We also investigated the temperature variation of the lattice spacing close to the magnetic ordering transition and have found a large magnetoelastic anomaly at the lock-in phase transition.
Keywords: A. Rare earth compounds; C. High energy X-ray magnetic scattering; C. Incommensurate structures; D. Lock-in phase transition; D. Magnetoelastic effect
Article Outline
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Fig. 1. Typical sample rotation or ω and the analyzer rotation scans of the 1,0,5/2 magnetic reflection of EuAs3 at several temperatures.
Fig. 2. Temperature dependence of the integrated intensity of the 1,0,5/2 magnetic reflection determined by longitudinal (radial reciprocal direction) and transverse scans of EuAs3. The intensity decreases with increasing temperature and drops abruptly at the first-order commensurate-to in-commensurate lock-in transition at TL≈10.2 K. The results are very similar to those obtained previously [3] and [4] by neutron diffraction. We have detected the satellite reflections corresponding to the incommensurate phase (see Fig. 3) but did not determine its temperature variation due to their very small intensities. The temperature variation of the satellite intensities has been thoroughly investigated both by neutron [3] and [4] and resonant X-ray diffraction at the Eu L absorption edge [8].
Fig. 3. Sample rotation or ω scan of the 2.95,0,138 magnetic reflection of the incommensurate magnetic phase of EuAs3 at T=10.2 K.
Fig. 4. (a) Temperature variation of the relative change in lattice spacing Δd/d corresponding to the −6,0,6 charge reflection. The continuous curve is a guide to the eye. (b) Temperature variation of the relative lattice spacing Δd/d close to the magnetic transitions, TL≈10.3 K and TN≈11 K. Δd/d decreases linearly with increasing temperature up to about the lock-in temperature TL≈10 K. Δd/d decreases more rapidly in the temperature range 10 K≤T≤11 K in the incommensurate phase. (c) Temperature variation of Δd/d in the commensurate antiferromagnetic phase. The continuous curve is the linear fit of the data.
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dependence of satellite peak intensity. The magnetic and charge scattering have definitely different 
