Abstract
Using pulsed NMR techniques, resonances of Cu nuclei which are near neighbors to Cr impurities (c=100 and 200 ppm) in CuCr (ϑk∼3 K) have been studied in the temperature range 1–4 K and applied fields Ho=20–125 kOe. At the highest fields and lowest temperatures the satellite shifts approach saturation. Above ∼40 kOe the spin-lattice relaxation rate T1−1 is proportional to T/Ho2, indicating that the dominant relaxation mechanism arises from transverse fluctuations of a polarized local moment. The measured rates yield a local-moment/conduction-electron exhange interaction ‖𝒥ρ‖/g=0.30, where g is the Cr g-value. Below ∼40 kOe T1−1 appears to be slightly enhanced in comparison with the high-field behavior, but becomes field independent below ∼30 kOe. Both effects are attributed to Kondo anomalies.
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