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

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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

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/7185

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Title: 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
Author: Heitmann, Thomas; Schmets, Alexander J. M.; Gaddy, John; Lamsal, Jagat; Petrovic, Marcus; Vojta, Thomas; Montfrooij, Wouter
Keywords: quantum phase transitions
percolation
spin glasses
random magnets
Date: 2010-01-14
Publisher: American Physical Society
Citation: Phys. Rev. B 81, 014411 (2010)
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
ISSN: 1098-0121

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