2010/09/08 by R. D. Johnson, Roger D. Johnson, T. Frawley +7 · 4 citations
Materials Science · Physics and Astronomy · #Computer science #Iron-based superconductors research #Magnetic Properties of Alloys #Physics #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · open access · doi:10.1103/physrevb.82.104407
published in Physical Review B 82(10) (American Physical Society) · 6 pages, 4 figures, 3 tables
openalex publication_date 2010/09/08 · arxiv created 2011/06/23 · arxiv updated 2011/06/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Two members of the isostructural R2CoGa8 intermetallic series, Er2CoGa8 and Tm2CoGa8, have been studied by powder neutron diffraction. Antiferromagnetic ordering of the rare-earth sublattices was confirmed to occur at 3.0 K and 2.0 K, respectively. Furthermore, determination of the critical exponent showed Er2CoGa8 to adopt a three-dimensional universality class. In spite of a common magnetic easy axis and similar structural characteristics, the antiferromagnetic structures were found to be different for the erbium- and thulium-based compounds. The corresponding magnetic space groups were determined to be P2ammm^\ensuremath' and PCmmm. The difference in magnetic structures is discussed based on crystal electric field effects that are known to be prevalent in such materials.