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2D Kagome Ordering in the 3D Frustrated Spinel Li2Mn2O4 | | C.R. Wiebe
; P.L. Russo
; A.T. Savici
; Y.J. Uemura
; G.J. MacDougall
; G.M. Luke
; S. Kuchta
; J.E. Greedan
; | | Date: |
15 Jul 2005 | | Subject: | Strongly Correlated Electrons; Statistical Mechanics | cond-mat.str-el cond-mat.stat-mech | | Abstract: | muSR experiments on the geometrically frustrated spinel oxide, Li2Mn2O4, show the development of spin correlations over a range of length scales with decreasing temperature. Increased relaxation below 150 K is consistent with the onset of spin correlations. Below 50 K, spin order on a length scale, which is long range for the muSR probe, appears abruptly in temperature, consistent with prior neutron diffraction results. The oscillations in the zero field asymmetry are analyzed using a three frequency model. By locating the muon site this is shown to be consistent with the unexpected 2D q = root 3 x root 3 structure on the Kagome planes proposed originally from neutron data. Longitudinal field data demonstrate that some spin dynamics persist even at 2 K. Thus, a very complex magnetic ground state, featuring the co-existence of long length scale 2D ordering and significant spin dynamics, is proposed. This is unusual considering the 3D topology of the Mn3+ spins in this material. | | Source: | arXiv, cond-mat/0507355 | | Services: | Forum | Review | PDF | Favorites | |
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