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dc.contributor.authorHeitmann, Thomas
dc.contributor.authorGaddy, John
dc.contributor.authorLamsal, Jagat
dc.contributor.authorPetrovic, Marcus
dc.contributor.authorMontfrooij, Wouter
dc.date.issued2010-05eng
dc.descriptiondoi:10.1063/1.3367976en
dc.description.abstractThe present work elucidates the series of magnetic phase transitions present in the series of spinel compounds Lix Mn1.96Li0.04 O4 x=0.0, 0.1, 0.2, 0.35, 0.5, 0.6, 0.8, 1.0 . These systems display dynamical scaling originating from the presence of magnetic clusters that form below 70 K. This scaling is similar to what has been observed in the 122 quantum critical point materials containing intrinsic disorder. We study this system using ac susceptibility in order to understand how disorder leads to fragmentation of the magnetic lattice. The Li doped system's antiferromagnetic AF ordering sets in below 70 K; however, for x=1 this ordering is limited to clusters of Mn4+ ions that are weakly coupled to each other. For the intermediate Li concentrations we observe the formation of individual spin clusters consistent with neutron scattering experiments and we find evidence for the coaligning of these clusters for T 20 K. A maximum in the peak of the susceptibility versus Li content between x=0.5 and x=0.35 indicates a crossover from a regime dominated by the cluster dynamics to one in which the long- range order of the delithiated -MnO2 phase begins to emerge. We discuss the magnetic phase diagram pertaining to short-range order in relationship to the dynamic response of these systems as measured by inelastic neutron scattering experiments. © 2010 American Institute of Physics.en
dc.description.sponsorshipThis research is supported by the Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Grant No. DE-FG02-07ER46381.en
dc.identifier.citationJ. Appl. Phys. 107, 09E143 (2010)en
dc.identifier.issn0021-8979
dc.identifier.urihttp://hdl.handle.net/10355/8188
dc.publisherAmerican Institute of Physicsen
dc.relation.ispartofPhysics and Astronomy publicationsen
dc.relation.ispartofcommunityUniversity of Missouri-Columbia. College of Arts and Sciences. Department of Physics and Astronomy
dc.subjectantiferromagnetic materialsen
dc.subjectcritical pointsen
dc.subjectmagnetic transitionsen
dc.subject.lcshAntiferromagnetismen
dc.subject.lcshLithium compoundsen
dc.subject.lcshMagnetic susceptibilityen
dc.subject.lcshNeutrons -- Diffractionen
dc.titleac susceptibility of the quantum critical point mimicking series Lix[Mn1.96Li0.04]O4 (x = 0.0,0.1,0.2,0.35,0.5,0.6,0.8,1.0)en
dc.typeArticleen


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