ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The reaction of Eu with a molten mixture of Li2Se and excess Se has produced a new rare earth dichalcogenide, EuSe2, with a type "a" antiferromagnetic structure. The compound crystallizes in the tetragonal space group I4/mcm forming into small single crystal rectangular blocks with their long axis along c. The high temperature magnetic susceptibility exhibits Curie–Weiss behavior with a ferromagnetic aitch-theta=15±1 K and an effective moment μeff=7.9±0.1 Bohr magnetons consistent with the theoretical value of 7.94 for the Eu2+ free ion. There is a peak in χc at Tn=8.0±0.5 K which is attributed to an antiferromagnetic transition. At T=2.5 K with the magnetic field, H, applied along c, M(H) exhibits a sharp increase near 1.5 T attributed to a metamagnetic transition. With H along a the moments saturate at about 5 T. A simple mean field model in which the Eu ions in the ab plane are coupled into ferromagnetic sheets, with alternate sheets along c coupled antiferromagnetically to form a bulk antiferromagnet is used to interpret the data. © 1999 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.369984
