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Magnetic properties of highly diluted PdFe and PtFe-alloys. Part II. Susceptibility at micro- and Milli-Kelvin temperatures

Journal of Low Temperature Physics, ISSN: 0022-2291, Vol: 104, Issue: 1-2, Page: 67-94
1996
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  • Citations
    14
    • Citation Indexes
      14
  • Captures
    6

Article Description

We have measured the 16 Hz susceptibility of the giant magnetic moments induced by Fe impurities in highly diluted PdFe and PtFe 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 T(x)/x ≅ 0,19 mK/ppm Fe for PdFe and the larger value 0.26 mK/ppm Fe for PtFe. This is the first observation of spin glass freezing in PtFe. In the low-temperature range T ≲ 0.5 T(x), the susceptibilities follow χ - χ ∼ T with small zero-temperature χ values for PdFe and vanishing χ values for PtFe. In the paramagnetic high-temperature range, we find χ ∼ (T - θ) at T ≳ 10 mK independent of 'x for PdFe, and at T ≳ 2 T(x) dependent of x for PtFe 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. © 1996 Plenum Publishing Corporation.

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