@article{Ney2010Advan-53397,
  year={2010},
  doi={10.1088/1367-2630/12/1/013020},
  title={Advanced spectroscopic synchrotron techniques to unravel the intrinsic properties of dilute magnetic oxides: the case of Co:ZnO},
  number={1},
  volume={12},
  journal={New Journal of Physics},
  author={Ney, Andreas and Opel, Matthias and Kaspar, Tiffany C. and Ollefs, Katharina and Gönnenwein, Sebastian T. B. and Gross, Rudolf and Nielsen, Karl-Wilhelm and Engelhard, Mark H. and Chambers, Scott A. and Potzger, Kay},
  note={Article Number: 013020}
}

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    <dc:contributor>Engelhard, Mark H.</dc:contributor>
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    <dcterms:abstract xml:lang="eng">The use of synchrotron-based spectroscopy has revolutionized the way we look at matter. X-ray absorption spectroscopy (XAS) using linear and circular polarized light offers a powerful toolbox of element-specific structural, electronic and magnetic probes that is especially well suited for complex materials containing several elements. We use the specific example of Zn&lt;sub&gt;1−x&lt;/sub&gt;Co&lt;sub&gt;x&lt;/sub&gt;O (Co:ZnO) to demonstrate the usefulness of combining these XAS techniques to unravel its intrinsic properties. We demonstrate that as long as phase separation or excessive defect formation is absent, Co:ZnO is paramagnetic. We can establish quantitative thresholds based on four reliable quality indicators using XAS; samples that show ferromagnet-like behaviour fail to meet these quality indicators, and complementary experimental techniques indeed prove phase separation. Careful analysis of XAS spectra is shown to provide quantitative information on the presence and type of dilute secondary phases in a highly sensitive, non-destructive manner.</dcterms:abstract>
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