Short-range order in the topological spin glass(D3O)Fe3(

Abstract

We use polarized xyz neutron diffraction to examine the nature of the freezing transition to an unconventional topological spin-glass state in the Sϭ5/2 kagomé antiferromagnet (D 3 O)Fe 3 (SO 4 ) 2 (OD) 6 . Measurements of the total magnetic scattering cross-section, S(Q), were taken in the momentum-transfer range 0.5 рQр2.5 Å Ϫ1 between the temperatures 1.5 and 250 K. The observation of two-dimensional correlations at 250 K, i.e., in excess of 14 times the freezing temperature, is in agreement with predictions of an anisotropyinduced spin-glass freezing transition in an ordered kagomé antiferromagnet.

High spin frustration in Co basedSwedenborgites

“…This recent close experimental approach to the ground state was in contrast to [8] and in qualitative agreement with what has been seen for other kagome systems like the jarosites [9,10]. A preference for staggered chirality has also been observed in magnetoplumbite compounds [11]. The low temperature 2D spin correlations that evolve, undisturbed by any significant 3D coupling, indicate a ground state with algebraically decaying correlations [7, 12 and Refs therein], for which only octopolar ordering is predicted [12].…”

Conventional and unconventional orderings in the jarosites

“…23,24 The depression of the freezing temperature with relation to the exchange energy is compatible with suggestions of the freezing being a consequence of a new energy scale-a reduced Kosterlitz-Thouless temperature-that approximates to θ/48 for an XY system. 25,26 The magnitude and spatial extension of the correlations increase only gradually with cooling, until they reach an apparent saturation value of ∼ 10Å at 1.5 K.…”

Static and dynamic properties of Mn2(OH)2(C4O4)

“…4). The sharp edge on the low Q side of the peak and slow fall off with increasing Q is characteristic of shortrange correlations, similar to that observed in twodimensional systems where the static structure factor can be described by a Warren function [8].…”