On the effect of short-range magnetic ordering on electron energy-loss spectra in spinels

Details On the effect of short-range magnetic ordering on electron energy-loss spectra in spinels On the effect of short-range magnetic ordering on electron energy-loss spectra in spinels

2004-01-14

arxiv.org/abs/cond-mat/0401235v1

Phys. Rev. B 68, 224420 (2003) (5 pages)

Physics

Condensed Matter

Materials Science

10 pages, 3 figures

Scientific paper

10.1103/PhysRevB.68.224420

The energy-loss near-edge structure (ELNES) at the oxygen $K$ edge in two $AB_2O_4$ spinels (A=Mg, B=Al,Cr) is reported. In $MgAl_2O_4$ the experimental data is successfully modelled within the LDA framework. In the case of $MgCr_2O_4$ spin-polarisation, in the form of antiferromagnetic ordering on the Cr sub-lattice, must be included despite the fact that the measurements were performed at approximately 30 times above $T_N$. A model in which dynamic short-range antiferromagnetic ordering is present at room temperature is proposed to explain the results of the experiments and calculations.

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