Abstract
The magnetic ordering of the ternary intermetallic compoundU(Pd1-xFex)2Ge2 (x = 0.01, 0.02) was studied by µSR in the temperaturerange T = 15-300 K. The low temperature state changes from the modulatedlongitudinal spin density wave LSDW (x = 0.01) with a propagation vector k = [0 0 3/4] (TN = 140 K) to a simple antiferromagnetic structure AF (x = 0.02) with k = [0 0 1] (TN = 140 K). In the AF phase (sample with x = 0.02) the uranium magnetic moment shows a monotonic temperature dependence.In the LSDW phase with k = [0 0 3/4] (sample with x = 0.01) themagnetic moments of uranium atoms located in two magnetically nonequivalentpositions (0 0 0) and (0 0 1) have different temperature dependences. One momentassumes a maximum at Tm1 = 50 K, while the other one does not display anypeculiarities. The results are discussed within a model of the superposition ofa square and sine modulation and are compared with neutron diffraction data. Theobserved peculiar temperature behaviour of the moments is connected with thetemperature variation of the initial phase φ of the LSDW modulation byΔφ = 0.2 rad.
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