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Fe valence state at the surface of the Fe0.5Cu0.5Cr2S4 spinel |
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| Authors: | Christian Taubitz Zhiwei Hu Nils Hollmann Yi‐Ying Chin Karsten Kuepper Vladimir Tsurkan H‐J Lin C T Chen L H Tjeng Manfred Neumann |
| Institution: | 1. Department of Physics, University of Osnabrück, Barbarastra?e 7, 49069 Osnabrück, Germany;2. Max‐Planck Institute for chemical physics of solids, Noethnitzer Str. 40, 01187 Dresden, Germany;3. II. Physical Institute, University of K?ln, Zülpicher Str. 77, 50937 K?ln, Germany;4. Department of Solid State Physics, University of Ulm, Albert‐Einstein‐Allee 11, 89069 Ulm, Germany;5. Institute of Applied Physics, Academy of Sciences of Moldova, 2028 Chisinau, Moldova;6. National Synchrotron Radiation Research Center, 101 Hsin‐Ann Road, Hsinchu 30077, Taiwan |
| Abstract: | Here we present X‐ray absorption measurements of a vacuum cleaved Fe0.5Cu0.5Cr2S4 single crystal. Measurements at different positions on the cleaved sample surface clearly reveal a difference between the valence state of the Fe ions in the sur‐ face layers and the valency of the Fe ions present in the bulk. These results confirm the findings of recent measurements outlined previously. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
| Keywords: | X‐ray absorption spinel Fe electronic structure |