Magnetic excitations in novel ferrimagnetic spinel ScMn2O4
ScMn2O4 (space group I41/amd) is structurally analogous to Mn3O4 with half of the 8d Mn sites replaced by the small Sc ion, suppressing the Jahn-teller distortion of the BO6 octahedra. The compound orders ferrimagnetically at T=58K (shubnikov group I41/am'd') but the observed Mn moments are about 3/4 of those found in Mn3O4, and the incoommensurate magnetic phase of the undoped compound is not observed. The curie-weiss temperature of nearly 600K indicates that this material is highly frustrated, possibly due to Sc/Mn site disorder disrupting exchange pathways. Likely as a result of this, there are anomalous magnetic fluctuations observed at low temperatures causing a novel feature in the susceptibility and the absence of a stable magnetic signal in uSR. We propose to use inelastic neutron scattering to study the spin excitations in the region of the susceptibility anomaly, and determine the nature of these anomalous low temperature phenomena.
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PRINCEP Andrew; BLUNDELL Stephen J; BOOTHROYD Andrew Timothy; DAVIES Nathaniel; PIOVANO Andrea; PRABHAKARAN Dharmalingam and Marein C. Rahn. (2015). Magnetic excitations in novel ferrimagnetic spinel ScMn2O4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1444
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