Inelastic neutron scattering study of magnetic excitations in uranium phosphates

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• 作者：Magnani ; N. ; Amoretti ; G. ; Blaise ; A. ; Caciuffo ; R. ; Dacheux ; N. ; Genet ; M. ; Stride ; J.A. ; Adroja ; D.T.
• 关键词：78.70.Nx ; 75.10.Dg ; Uranium phosphate ; Crystal field ; Inelastic neutron scattering
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2004
• 出版时间：May, 2004
• 年：2004
• 卷：272-276
• 期：Supplement
• 页码：E203-E204
• 全文大小：191 K

文摘

The results of inelastic neutron scattering experiments performed on the compounds U_1−xTh_x(UO₂)(PO₄)₂ (x=0,0.5) and U₂O(PO₄)₂ are presented. The partial substitution of uranium with thorium in the former compound was performed to decouple the magnetic dimers and observe a pure single-ion behaviour. The INS data indicate that the main interaction, responsible for the magnetic excitations observed in all of the compounds examined, is the crystal field due to the oxygen ligand cage that surrounds the U⁴⁺ sites, rather than the exchange interaction between magnetic ions.