The distribution of hyperfine fields in two alloys of iron as a function of temperature and pressure

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Abstract
The distribution of hyperfine fields at iron atoms in FeCo and FeNi alloys containing 1/2% of added impurity has been measured as a function of hydrostatic pressure up to 16 kbar. The frequency ( nu ) of the main and satellite lines of FeCo was found to change such that ( delta ln nu / delta P)T=-1.75*10-7 kg-1 cm2. In FeNi the value for the main line was -1.64*10-7 kg-1 cm2 and -2.02*10-7 kg cm-2 for the satellite line. The temperature dependence of the difference between the normalised main and satellite lines was found to be proportional to T3/2 at temperature T, even after the measurements had been reduced to constant volume, which is in disagreement with the prediction of spin wave theory.