Spin re-orientation in FeCr2S4
| Autor: | J. Engelke, F. J. Litterst, Vladimir Tsurkan, G. M. Kalvius, F. E. Wagner, Alois Loidl, A. Krimmel |
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| Rok vydání: | 2011 |
| Předmět: |
Nuclear and High Energy Physics
Condensed matter physics Spin polarization Magnetic structure Chemistry Jahn–Teller effect Muon spin spectroscopy Condensed Matter Physics Atomic and Molecular Physics and Optics Curie temperature Condensed Matter::Strongly Correlated Electrons Physical and Theoretical Chemistry Ground state Spin (physics) Hyperfine structure |
| Zdroj: | Hyperfine Interactions. 202:57-61 |
| ISSN: | 1572-9540 0304-3843 |
| DOI: | 10.1007/s10751-011-0338-0 |
| Popis: | The spinel FeCr2S4has been studied intensely for its peculiar magnetic and local structural changes which are sensitively influenced by the Jahn–Teller properties of Fe2 + in tetrahedral sulfur coordination. Recent muon spin rotation data give strong evidence that the commonly assumed collinear magnetic structure of this compound is only found between the Curie temperature TC = 165 K and 50 K. For lower temperatures a helical structure has been proposed. We present new Mossbauer spectroscopic data taken on the same sample as used for muon spin rotation. Also the hyperfine spectra revealing non-equivalent iron sites support the appearance of a spin re-orientation around 50 K which may be related to the onset of short-range orbital order. Below 20 K severe dynamic broadenings are found which may indicate orbital fluctuations. Orbital order occurs around 11 K accompanied by severe changes in the crystalline electric field ground state as traced from quadrupole interaction. |
| Databáze: | OpenAIRE |
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