2011/01/19 by A. Furrer, A. Fürrer, F. Juranyi +7 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Anisotropy #Chemistry #Cluster (spacecraft) #Condensed matter physics #Ion #Magnetic Properties of Alloys #Magnetic and transport properties of perovskites and related materials #Magnetic anisotropy #Magnetic field #Magnetization #Materials science #Optics #Physics #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.83.024404
published as Phys. Rev. B 83, 024404 (2011) · 9 pages, 10 figures, 1 table
openalex publication_date 2011/01/19 · arxiv created 2011/06/03 · arxiv updated 2015/05/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 are difficult to assess experimentally and often ambiguous. Here we propose a technique that 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 CsMnxMg_1\ensuremath-xBr3 (0.05\ensuremath\leqslantx\ensuremath\leqslant0.40). 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.