Abstract
We have measured the 16 Hz susceptibility of the giant magnetic moments induced by Fe impurities in highly dilutedPdFex andPtFex samples with 2.5 ppm ≤ x ≤ 75 ppm in a wide temperature range, 30 μK≤ T ≤ 300 mK, and at static magnetic fields 0,01 mT≤ B ≤ 25 mT. We find spin glass freezing at Tf(X)/X≅0,19mK/ppm Fe forPdFex and the larger value 0.26 mK/ppm Fe forPtFex. This is the first observation of spin glass freezing inPtFex. In the low-temperature range T ≲ 0.5Tf(x), the susceptibilities follow χ — χ0∽ T with small zero-temperature χ0 values forPdFeX and vanishing χ0 values forPtFex. In the paramagnetic high-temperature range, we find χ℞(T — θ)it-1 at T ≥ 10 mK independent of x forPdFex, and at T ≥ 2Tf(x) dependent of x forPtFex with vanishing θ values for both systems. The data compare well to the predictions of the Thouless-Anderson-Palmer “TAP” approach of the Sherrington-Kirkpatrick “SK” model for spin glasses.
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