Direct observation of local Mn-Mn distances in the paramagnetic compound CsMn(x)Mg(1-x)Br3.
- Furrer A Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
- Strässle T
- Embs JP
- Juranyi F
- Pomjakushin V
- Schneider M
- Krämer KW
- 2011-10-27
Published in:
- Physical review letters. - 2011
English
We introduce a novel method for local structure determination with a spatial resolution of the order of 0.01 Å. 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=α (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 CsMn(x)Mg(1-x)Br3 (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.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevLett.107.115502
- PMID 22026684
- Persistent URL
- https://sonar.ch/global/documents/278447
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