Pressure Dependences of the Hyperfine Fields at the ¹¹⁵In and ⁷⁵As Impurity Nuclei in Iron

Abstract

The NMR frequencies of the ¹¹⁵In and ⁷⁵As 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 ¹¹⁵In and ⁷⁵As NMR frequencies decrease linearly with increasing the pressure. The pressure dependences of the hyperfine fields are obtained as ∂ ln ¹¹⁵H_i⁄∂p=−(2.25±0.05)×10⁻⁷ bar⁻¹ and ∂ ln ⁷⁵H_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.