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Neutron-scattering studies on CeM2Ge2(M=Ag, Au, and Ru)

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Loidl, A., Knorr, K., Knopp, G., Krimmel, A., Caspary, R., Böhm, A., et al. (1992). Neutron-scattering studies on CeM2Ge2(M=Ag, Au, and Ru). Physical Review B, 46(15), 9341-9351. doi:10.1103/PhysRevB.46.9341.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-D777-5
Abstract
The results of elastic, quasielastic, and inelastic neutron-scattering studies on polycrystalline CeM2Ge2 (M = Ag, Au, and Ru) are presented. All compounds reveal long-range magnetic order at low temperatures. Ferromagnetic (M = Ru), antiferromagnetic (M = Au), and incommensurate (M = Ag) structures were detected. Using time-of-flight (TOF) techniques, the crystalline electric-field splittings were determined. With high-resolution TOF experiments the temperature and wave-vector dependence of the magnetic relaxation rate was studied. Korringa-like behavior was found for the Au and Ru compounds. In CeAg2Ge2 the temperature dependence of the magnetic relaxation rate exhibits a square-root dependence at high temperatures and shows a residual linewidth for low T. This behavior can be explained by strong hybridization effects of the f electrons with the delocalized band states which are active in heavy fermion systems. Previous results in CeCu2Ge2 and CeNi2Ge2 are included, whenever necessary. Detailed comparison is made with results obtained in the disilicides.