Magnetic ordering in GdNi2B2C revisited by resonant x-ray scattering: Evidence for the double-q model

TitleMagnetic ordering in GdNi2B2C revisited by resonant x-ray scattering: Evidence for the double-q model
Publication TypeJournal Article
Year of Publication2013
AuthorsNormile PS, Rotter M, Detlefs C, Jensen J, Canfield PC, Blanco JA
Journal TitlePhysical Review B
Volume88
Pages054413
Date Published08
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000323153800002
Keywordsmagnetoelastic paradox
Abstract

Recent theoretical efforts aimed at understanding the nature of antiferromagnetic ordering in GdNi2B2C predicted double-q ordering. Here we employ resonant elastic x-ray scattering to test this theory against the formerly proposed, single-q ordering scenario. Our study reveals a satellite reflection associated with a mixed-order component propagation wave vector, viz., (q(a),2q(b), 0) with q(b) = q(a) approximate to 0.55 reciprocal lattice units, the presence of which is incompatible with single-q ordering but is expected from the double-q model. A (3q(a),0,0) wave vector (i.e., third-order) satellite is also observed, again in line with the double-q model. The temperature dependencies of these along with that of a first-order satellite are compared with calculations based on the double-q model and reasonable qualitative agreement is found. By examining the azimuthal dependence of first-order satellite scattering, we show the magnetic order to be, as predicted, elliptically polarized at base temperature and find the temperature dependence of the "out of a-b plane" moment component to be in fairly good agreement with calculation. Our results provide qualitative support for the double-q model and thus in turn corroborate the explanation for the "magnetoelastic paradox" offered by this model.

URL<Go to ISI>://WOS:000323153800002
DOI10.1103/PhysRevB.88.054413