Direct observation of local Mn-Mn distances in the paramagnetic compound CsMnxMg1-xBr3
| Autor: | Furrer, A., Strässle, Th., Embs, J. P., Juranyi, F., Pomjakushin, V., Schneider, M., Krämer, K. W. |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Phys, Rev. Lett. 107, 115502 (2011) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.107.115502 |
| Popis: | We introduce a novel method for local structure determination with a spatial resolution of the order of 0.01 Angstroem. It can be applied to materials containing clusters of exchange-coupled magnetic atoms. We use neutron spectroscopy to probe the energies of the cluster excitations which are determined by the interatomic coupling strength J. Since for most materials J is related to the interatomic distance R through a linear relation dJ/dR={\alpha} (for dR/R<<1), we can directly derive the local distance R from the observed excitation energies. This is exemplified for the mixed one-dimensional paramagnetic compound CsMnxMg1 xBr3 (x=0.05, 0.10) containing manganese dimers oriented along the hexagonal c-axis. Surprisingly, the resulting Mn-Mn distances R do not vary continuously with increasing internal pressure, but lock in at some discrete values. Comment: 16 pages, 2 tables, 3 figures |
| Databáze: | arXiv |
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