A systematic study of magnetic order in divalent europium perovskites |
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| Authors: | JE Greedan Chai-Ling Chien Richard G Johnston |
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| Institution: | 1. Institute for Materials Research, McMaster University, Hamilton, Ontario L8S 4M1, Canada;1. Department of Chemistry, McMaster University, Hamilton, Ontario L8S 4M1, Canada;2. Department of Physics, The Johns Hopkins University, Baltimore, Maryland 21218 USA;3. Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802 USA |
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| Abstract: | The magnetic properties of a series of cubic perovskite materials, Eu(Al0.5Ta0.5)O3, Eu(Mg0.5W0.5)O3, and Eu(Lu0.5Ta0.5)O3 have been investigated using bulk magnetic and Mössbauer techniques. Eu(Al0.5Ta0.5)O3 is a ferromagnet (Tc ～ 5°K, θc = + 8°K), Eu(Lu0.5Ta0.5)O3 is an antiferromagnet (TN = 4.0, θc = ?8°K), while Eu(Mg0.5W0.5)O3 is probably antiferromagnetic (TN = 2.8°K, θc = ? 1°K). These data are compared with the known properties of EuLiH3 and EuTiO3 and a sharp drop in θc as a function of increasing lattice constant is noted. A molecular field theory analysis of the data yields two possible sets of nn (J1) and nnn (J2) exchange constants for each compound which are compared with existing theories. |
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