2006/01/06 by A. S. Wills, M. E. Zhitomirsky, B. Canals +4 · 8 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Nuclear materials and radiation effects #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/18/3/l02
published as J. Phys.: Condens. Matter 18 L37 (2006) · 6 pages
arxiv created 2006/02/06 · arxiv updated 2009/12/01
Low-temperature powder neutron diffraction measurements are performed in the ordered magnetic state of the pyrochlore antiferromagnet Gd 2 Sn 2 O 7 . Symmetry analysis of the diffraction data indicates that this compound has the ground state predicted theoretically for a Heisenberg pyrochlore antiferromagnet with dipolar interactions. The difference in the magnetic structure of Gd 2 Sn 2 O 7 andof nominally analogous Gd 2 Ti 2 O 7 is found to be determined by a specific type of third-neighbour superexchange interaction on the pyrochlore lattice between spins across empty hexagons.