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670778.0 [No comment] 27.11.2013 14:38 Released

ID: 670778.0, MPI für Chemische Physik fester Stoffe / publications 2013
Magnetic ordering in GdNi2B2C revisited by resonant x-ray scattering: Evidence for the double-q model
Authors:Normile, P. S.; Rotter, M.; Detlefs, C.; Jensen, J.; Canfield, P. C.; Blanco, J. A.
Date of Publication (YYYY-MM-DD):2013-08-14
Title of Journal:Physical Review B
Issue / Number:5
Start Page:054413-1
End Page:054413-7
Sequence Number of Article:054413
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Ina Werner
Affiliations:MPI für chemische Physik fester Stoffe
Identifiers:ISI:000323153800002 [ID No:1]
ISSN:1098-0121 [ID No:2]