Physics and Astronomy, Ames Laboratory
Journal or Book Title
Physical Review B
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., (qa,2qb,0) with qb=qa≈0.55 reciprocal lattice units, the presence of which is incompatible with single-q ordering but is expected from the double-q model. A (3qa,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.
American Physical Society
Normile, P. S.; Rotter, M.; Detlefs, C.; Jensen, J.; Canfield, Paul C.; and Blanco, J. A., "Magnetic ordering in GdNi2B2C revisited by resonant x-ray scattering: Evidence for the double-q model" (2013). Physics and Astronomy Publications. 610.