2009
DOI: 10.1063/1.3073660
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Magnetic ordering in the spinel compound Li[Mn2−xLix]O4(x=,0.04)

Abstract: The two B-site ions Mn 3+ and Mn 4+ in the stoichiometric spinel structure LiMn 2 O 4 form a complex, columnar ordered pattern below the charge-ordering transition at room temperature. On further cooling to below 66 K, the system develops long-range antiferromagnetic order. In contrast, whereas lithium-substituted Li͓Mn 2−x Li x ͔O 4 also undergoes a charge-ordering transition around room temperature, it only displays frozen in short-range magnetic order below ϳ25-30 K. We investigate to what extent the colum… Show more

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Cited by 6 publications
(8 citation statements)
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“…Our susceptibility measurements combined with what has been learned from neutron scattering experiments suggests the following evolution of magnetic clusters in Li x ͓Mn 1.96 Li 0.04 ͔O 4 as a function of x. On the fully lithiated end ͑x = 1.0͒ we find a network of magnetic clusters consisting primarily of the Mn 4+ eightfold rings as described by Gaddy et al 7 Small amounts of Li substitution on the Mn sites have disordered the neat eightfold ring pattern found 8 in the stoichiometric material; the lithium ions replace some of the Mn ions on the B-sites and force some of the Mn 3+ ions to change to Mn 4+ and partake in the Mn 4+ ordering; this results in clusters that are somewhat irregular in size and shape. Removing Li from the A-sites, i.e., for x Ͻ 1, drives more of the Mn 3+ ions ͑surrounding the clusters͒ to the Mn 4+ valence state.…”
mentioning
confidence: 60%
“…Our susceptibility measurements combined with what has been learned from neutron scattering experiments suggests the following evolution of magnetic clusters in Li x ͓Mn 1.96 Li 0.04 ͔O 4 as a function of x. On the fully lithiated end ͑x = 1.0͒ we find a network of magnetic clusters consisting primarily of the Mn 4+ eightfold rings as described by Gaddy et al 7 Small amounts of Li substitution on the Mn sites have disordered the neat eightfold ring pattern found 8 in the stoichiometric material; the lithium ions replace some of the Mn ions on the B-sites and force some of the Mn 3+ ions to change to Mn 4+ and partake in the Mn 4+ ordering; this results in clusters that are somewhat irregular in size and shape. Removing Li from the A-sites, i.e., for x Ͻ 1, drives more of the Mn 3+ ions ͑surrounding the clusters͒ to the Mn 4+ valence state.…”
mentioning
confidence: 60%
“…Neutron scattering experiments showed 5,8,9 that while long-range order does not emerge down to 4 K in the doped sample, the Mn 4+ ions in the eightfold rings line up antiferromagnetically ͑AF͒ below 66 K ͑the undoped sample shows AF order 7 at ϳ66 K͒. Since the structure factor associated with the Mn 4+ scattering does not change 5 between 4 and 70 K, we can assume that AF order is present within the rings in this temperature range, and that the rings behave as so-called superspins.…”
Section: +mentioning
confidence: 99%
“…Since the structure factor associated with the Mn 4+ scattering does not change 5 between 4 and 70 K, we can assume that AF order is present within the rings in this temperature range, and that the rings behave as so-called superspins. The dynamics of these superspins appears 5,9 to freeze out below ϳ25 K. The Mn 3+ ions do not freeze out down to 4 K. Thus, Li͓Mn 1.96 Li 0.04 ͔O 4 is a purely classical system ͑from a phase transition point of view͒ that is disordered because of geometric frustration and Li/Mn disorder with clusters of AFaligned Mn 4+ ions ͑superspins͒ present below 66 K. Insulating Li͓Mn 1.96 Li 0.04 ͔O 4 should not exhibit any type of quantum critical scaling, however, next we argue that the response shows the hallmarks of E / T scaling that were thought to be associated exclusively with quantum criticality. We argue, without using any particular line shape analysis, that scattering originating from the superspins effectively mimics quantum scaling behavior.…”
Section: +mentioning
confidence: 99%
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“…This is an extension of the work of Lamsal et al 28 who investigated the possibility of E / T scaling in the x = 1.0 compound. We show that the dynamics of the magnetic clusters that are present in these systems 29 below ϳ70 K do indeed mimic E / T-scaling behavior for all concentrations x; these concentrations cover geometrically frustrated short-range magnetism ͑x = 1.0͒ to long-range magnetic ordering ͑x = 0.2͒. Thus, we show that the behavior previously associated with quantum criticality, which was solely ascribed to the competition between ordering and shielding tendencies, is instead strongly influenced by the emergence of magnetic clusters in these QCP systems.…”
Section: Introductionmentioning
confidence: 99%