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    Magnetic excitations in the spinel compound Lix[Mn1.96Li0.04]O4 (x=0.2,0.6,0.8,1.0): How a classical system can mimic quantum critical scaling

    Heitmann, Thomas
    Schmets, Alexander J. M.
    Gaddy, John
    Lamsal, Jagat
    Petrovic, Marcus
    Vojta, Thomas
    Montfrooij, Wouter
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    [PDF] MagneticExcitationsSpinelCompound.pdf (4.863Mb)
    Date
    2010
    Format
    Article
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    Abstract
    We present neutron-scattering results on the magnetic excitations in the spinel compounds Lix Mn1.96Li0.04 O4 x=0.2, 0.6, 0.8, 1.0 . We show that the dominant excitations below T 70 K are determined by Mn ions located in clusters, and that these excitations mimic the dynamic scaling found in quantum critical systems that also harbor magnetic clusters, such as CeRu0.5Fe1.5Ge2. We argue that our results for this classical spinel compound suggest that the unusual response at low temperatures as observed in quantum critical systems that have been driven to criticality through substantial chemical doping is at least partially the result of the fragmentation of the magnetic lattice into smaller units.
    URI
    http://hdl.handle.net/10355/7185
    Citation
    Phys. Rev. B 81, 014411 (2010)
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    • Missouri Research Reactor publications (MU)
    • Missouri Research Reactor publications (MU)

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