Experimental evidence of noncollinear magnetism in gadolinium tetraboride
PhysRevB_72_052407.pdf 165 KB
Blanco, J. A.
Brown, P. J.
Recently, the collinear or noncollinear character of the magnetic structure of gadolinium tetraboride (GdB4), laying the magnetic moments in the ab plane, becomes a matter of controversy. In the present study, the observations obtained from resistivity, specific heat, and magnetic susceptibility measurements on a single crystal sample contain no evidence for a structural phase transition in this material above or below the Néel temperature TN. In addition to these measurements, the resonant x-ray Bragg diffraction structure factors derived from all the possible arrangements for Gd magnetic moments compatible with the room temperature tetragonal P4/mbm space group are calculated. The intensity derived with Shubnikov magnetic P4/m′b′m′ and P4′ /m′b′m space groups are found to account for the previously published resonant x-ray diffraction data on GdB4. (Both Shubnikov groups have magnetoelectric symmetry.)
Physical Review B - Condensed Matter and Materials Physics
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American Physical Society
Copyright (c) 2005 American Physical Society.
Graduate School of Advanced Sciences of Matter