EuO1-x is a material of interest for its possible spintronics applications. It exhibits a semiconductor-to-metal transition associated with the onset of ferromagnetism and a large negative magnetoresistance response. Because the transport and magnetic properties of EuO1-x are similar to another class of materials, the perovskite manganites, and phase inhomogeneity is important for describing the properties of the manganites, one interesting question is whether phase inhomogeneity is also relevant for describing EuO1-x. In this talk, I will explore what phase inhomogeneity is, the evidence for phase inhomogeneity in the manganites, and our current understanding of the nature of phase inhomogeneity in EuO1-x.
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