Fe valence state at the surface of the Fe0.5Cu0.5Cr2S4 spinel (pages 338–339)
Christian Taubitz, Zhiwei Hu, Nils Hollmann, Yi-Ying Chin, Karsten Kuepper, Vladimir Tsurkan, H.-J. Lin, C. T. Chen, L. H. Tjeng and Manfred Neumann
Version of Record online: 10 SEP 2010 | DOI: 10.1002/pssr.201004302
The authors of this Letter investigate single crystalline Fe0.5Cu0.5Cr2S4 in order to solve a long standing issue. This material has attracted considerable attention due to a variety of interesting electronic and magnetic properties. In spite of many efforts, the Fe valence state of Fe0.5Cu0.5Cr2S4 is still under discussion. Here X-ray absorption spectra are presented that, surprisingly, show Fe to be in an inhomogeneous valence state.