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

Journal article (2010)
Department
Design & Construction (CEG) (TU Delft)
Copyright: © 2010 The Author(s); American Physical Society
DOI: https://doi.org/doi:10.1103/PhysRevB.81.014411
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Published Date

14-01-2010

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Source:

Physical Review B, 81 (1), 2010

Faculty

Civil Engineering and Geosciences

Department

Design & Construction

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.

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