Herein, evidence for the long-sought finite hyperfine interaction in the high-pressure hexagonal close-packed ε-iron is gained through synchrotron radiation perturbed angular correlation spectroscopy. This method yields an energy splitting of 3.5(5)neV between the mIe= ± 1/2 and mIe = ± 3/2 nuclear sublevels of the iron-57 14.412-keV nuclear excited state at 30(1)GPa and room temperature. This energy splitting is related to a nuclear quadrupole hyperfine interaction with an electric field gradient of eq=1.2(2) x 1016V/cm2. However, there is still a possibility that the splitting of the iron-57 nuclear levels is related to a modest magnetic hyperfine interaction of ca. 0.40(5) T.
D. Bessas and I. Sergueev and K. Glazyrin and C. Strohm and I. Kupenko and D. G. Merkel and G. J. Long and F. Grandjean and A. I. Chumakov and R. Ruffer, "Revealing the Hidden Hyperfine Interactions in ϵ-Iron," Physical Review B, vol. 101, no. 3, American Physical Society (APS), Jan 2020.
The definitive version is available at https://doi.org/10.1103/PhysRevB.101.035112
Keywords and Phrases
Electric fields; Excited states; Synchrotron radiation, Electric field gradients; Energy splittings; Hexagonal close packed; High pressure; Hyperfine interactions; Nuclear levels; Nuclear quadrupole; Perturbed angular correlation spectroscopy, Iron
International Standard Serial Number (ISSN)
Article - Journal
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01 Jan 2020