MÖSSBAUER STUDY OF A VERY DILUTE Pt(Fe) ALLOY AT VERY LOW TEMPERATURES

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Abstract
The magnetic behaviour of a very dilute (< 50 ppm) Pt(Fe) alloy has been studied by Mössbauer spectroscopy down to 0.06 K and in external fields between 0 and 50 kOe. At low temperatures both the initial local susceptibility and the dependence of the saturation hyperfine field on applied field indicate a small reduction of the Fe moment. A magnetic hyperfine splitting is seen below 0.2-0.1 K, even in the absence of applied field. This is interpreted as a paramagnetic hyperfine interaction observable because of slow electronic relaxation

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