Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-06-03
Phys. Rev. B 83, 024404 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 10 figures, 1 table
Scientific paper
Anisotropy effects can significantly control or modify the ground-state properties of magnetic systems. Yet the origin and the relative importance of the possible anisotropy terms is difficult to assess experimentally and often ambiguous. Here we propose a technique which allows a very direct distinction between single-ion and two-ion anisotropy effects. The method is based on high-resolution neutron spectroscopic investigations of magnetic cluster excitations. This is exemplified for manganese dimers and tetramers in the mixed compounds CsMnxMg1-xBr3 (0.05\leqx\leq0.40). Our experiments provide evidence for a pronounced anisotropy of the order of 3% of the dominant bilinear exchange interaction, and the anisotropy is dominated by the single-ion term. The detailed characterization of magnetic cluster excitations offers a convenient way to unravel anisotropy effects in any magnetic material.
Furrer A.
Juranyi Fanni
Kraemer K. W.
Schneider Manfred
Straessle Th.
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