Abstract
Modulated adiabatic passage on oriented nuclei has been used in combination with beta-ray detection to make a definitive measurement of a nuclear electric quadrupole hyperfine interaction in elemental iron. For ${}^{59}\mathrm{Fe}$ in single-crystal iron magnetized along the easy $〈100〉$ direction ${P/h=3\mathrm{eQV}}_{\mathrm{ZZ}}/4I(2I\ensuremath{-}1)h=+19.4(5)\mathrm{kHz},$ and along the hard $〈111〉$ direction $P/h=+20.2(5)\mathrm{kHz}.$ Theoretical estimates for the ${}^{59}\mathrm{Fe}$ ground-state nuclear electric quadrupole moment are considered in terms of the particle-rotor model and the shell model. A value of $Q=+0.19(3)$ b is adopted, which, in turn, is used to obtain electric field gradient values at the Fe site of ${V}_{\mathrm{ZZ}}=+1.7(3)\ifmmode\times\else\texttimes\fi{}{10}^{19}{\mathrm{V}\mathrm{}\mathrm{m}}^{\ensuremath{-}2}$ and $+1.8(3)\ifmmode\times\else\texttimes\fi{}{10}^{19}{\mathrm{V}\mathrm{}\mathrm{m}}^{\ensuremath{-}2}$ for magnetization along the easy and hard directions, respectively. Comparisons are made with previously measured results for the nearby $3d$ impurities Mn and Co in Fe.
Published Version
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