Is the nature of magnetic order in copper-oxides and in iron-pnictides different?

Details Is the nature of magnetic order in copper-oxides and in iron-pnictides different? Is the nature of magnetic order in copper-oxides and in iron-pnictides different?

2009-02-19

arxiv.org/abs/0902.3450v1

Solid State Communications 150, (2010) 62-65

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

10.1016/j.ssc.2009.10.005

We use the results of first-principles electronic structure calculations and a strong coupling perturbation approach, together with general theoretical arguments, to illustrate the differences in super-exchange interactions between the copper-oxides and iron-pnictides. We show that the two magnetic ground states can be understood in a simple manner within the same theoretical foundation. Contrary to the emerging view that magnetic order in the iron-pnictides is of itinerant nature, we argue that the observed magnetic moment is small because of frustration introduced by the electrons of the Fe orbitals as they compete to impose their preferred magnetic ordering.

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