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Phase transitions, noncollinear magnetism, and magnetoelectric symmetry in gadolinium tetraboride

DOI: 10.1103/PhysRevB.70.172414 DOI Help

Authors: S. W. Lovesey (Diamond Light Source) , J. Fernández Rodríguez (Universidad de Oviedo) , J. A. Blanco Rodriguez (Universidad de Oviedo) , P. J. Brown (Institut Laue-Langevin)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 70

State: Published (Approved)
Published: November 2004

Abstract: Resonant x-ray Bragg diffraction data for gadolinium tetraboride (GdB4), gathered at the Gd L3 edge above and below a transition temperature TN=42K, is shown to imply that a structural phase transition occurs at temperatures above the onset of long-range magnetic order in the Gd moments. Specifically, the room-temperature tetragonal structure P4∕mbm would appear to change to orthorhombic P21212, which is a continuous structural phase transition in Landau and renormalization-group theories. Below TN, a configuration of Gd moments is established, which is consistent with the magnetic Shubnikov group P21212, where moments are constrained to lie in the plane normal to the c axis. The crystal structure and magnetic point symmetry (222) inferred, is one of the class of 58 magnetic groups that can show the magnetoelectric effect.

Journal Keywords: Boron Alloys; Bragg Reflection; Gadolinium; Gadolinium Alloys; Group Theory; Magnetic Moments; Magnetism; Phase Transformations; Renormalization; Shubnikov-De Haas Effect; Tetragonal Lattices; Transition Temperature; X-Ray Diffraction

Subject Areas: Physics


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