Pressure Dependences Of The Hyperfine Fields At The In-115 And As-75 Impurity Nuclei In Iron

The NMR frequencies of the 115 In and 75 As impurity nuclei in ferromagnetic iron have been measured as a function of the hydrostatic pressure up to 10 kbar at 195 and 273 K. Both the 115 In and 75 As NMR frequencies decrease linearly with increasing the pressure. The pressure dependences of the hyperfine fields are obtained as ∂ln 115 H i /∂ p =-(2.25±0.05)×10 -7 bar -1 and ∂ln 75 H i /∂ p =-(9.84±0.05)×10 -7 bar -1 at 195 K. The experimental results are qualitatively discussed, together with those for other nonmagnetic impurities in iron.