Abstract
Muon spin relaxation (μSR) experiments on the geometrically frustrated spinel oxide,Li2Mn2O4, show the development of spin correlations over a range oflengthscales with decreasing temperature. Increased relaxation below∼150 K isconsistent with the onset of spin correlations. Below 50 K, spin order, on a lengthscale which is long rangefor the μSR probe, appears abruptly in temperature, consistent with prior neutron diffraction results.The oscillations in the zero field asymmetry are analysed using a three frequency model. Bylocating the muon site, this is shown to be consistent with the unexpected 2D structure on the Kagomé planes proposed originally from neutron data. Longitudinal fielddata demonstrate that some spin dynamics persist even at 2 K. Thus, a very complexmagnetic ground state, featuring the coexistence of long lengthscale 2D ordering andsignificant spin dynamics, is proposed. This is unusual considering the 3D topology of theMn3+ spins in this material.
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