Abstract
The chemical distributions and electronic structures of Ge1−xTx (T=Cr, Fe) diluted ferromagnetic semiconductors have been investigated by employing scanning photoelectron microscopy (SPEM), x-ray absorption spectroscopy (XAS), and photoemission spectroscopy (PES). The SPEM images and PES spectra of Ge1−xTx show the stripe-shaped regions due to the inhomogeneous concentration distributions of T ions. T2p XAS spectra indicate that T ions are mainly in the divalent states, and that they do not form pure metal clusters. This study reveals that Ge1−xTx crystals are chemically phase-separated, suggesting that the observed ferromagnetic ordering in Ge1−xTx arises from the magnetic properties of the T-rich Ge1−xTx phases.
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