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The electronic and magnetic properties of the excess Fe in iron tellurideFe$_{(1+x)}$Te are investigated by density functional calculations. We findthat the excess Fe occurs with valence near Fe$^{+}$, and therefore provideselectron doping with approximately one carrier per Fe, and furthermore that theexcess Fe is strongly magnetic. Thus it will provide local moments thatinteract with the plane Fe magnetism, and these are expected to persist inphases where the magnetism of the planes is destroyed for example by pressureor doping. These results are discussed in the context of superconductivity.

Density Functional Study of Excess Fe in Fe$_{1+x}$Te: Magnetism and Doping