Abstract
The magnetic susceptibility, Д m, of U 3Si 2 has been measured in the temperature range 4–1000 K. It exhibits a broad maximum ( T max ⋍300 K ) which may relate to the spin fluctuation process. Below T max the microscopic magnetic properties of U 3Si 2 have been investigated by the 29Si Knight shift ( K) and spin-lattice relaxation rate (1/ T 1). The Knight shift versus susceptibility relation gives a hyperfine coupling constant H hf=48 kOe/ μ B. From the extrapolated limit of the linear K vs Д m curve a large positive temperature-independent contribution to Д m is obtained. This is attributable to the Van Vleck-type orbital paramagnetism, to be expected in metals with unfilled degenerate bands. The temperature dependencies of Д m, K and (1/ T 1) give evidence for the fluctuations of the uranium 5f moments. The characteristic fluctuation rate is ~3 k B T max/ ħ when an effective number of uranium ions involved in the transferred hyperfine interaction is limited to first neighbours.
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