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• W2023278926 abstract "The magnitude and sign of the nuclear quadrupole interaction of the 247-keV excited state of $^{111}mathrm{Cd}$ has been measured in a number of noncubic metals by means of the technique of $ensuremath{beta}ensuremath{-}ensuremath{gamma}$ time-differential perturbed angular correlations. The state was populated by the unique first-forbidden $ensuremath{beta}$ decay of 7.5-day $^{111}mathrm{Ag}$ which was implanted by an an isotope separator into single crystals of Be, Mg, Ti, Zn, Sn, Re, Hf, and Bi. Well-defined precession patterns indicating unique lattice location of the $^{111}mathrm{Cd}$ impurity have been observed in all these cases except Hf and Bi. The sign and magnitude of the quadrupole coupling constants ${e}^{2}mathrm{qQ}$ have thus been derived. Using lattice-sum calculations for the lattice electric field-gradient (EFG) $e{q}_{mathrm{latt}}$, $Q=+0.77$ b for the quadrupole moment of the 247-keV level of $^{111}mathrm{Cd}$ and a Sternheimer antishielding factor ${ensuremath{gamma}}_{ensuremath{infty}}=ensuremath{-}29.3$ for Cd, the EFG presumably due to the conduction electrons $e{q}_{mathrm{el}}$, has been derived for each of these cases. These results strongly indicate that $e{q}_{mathrm{el}}$ is linearly related to $e{q}_{mathrm{latt}}(1ensuremath{-}{ensuremath{gamma}}_{ensuremath{infty}})$. In an attempt to examine whether such a simple relation is effective in metallic systems in general, a survey of all ${e}^{2}mathrm{qQ}$ values (with signs) measured in noncubic metals has been made. This survey reveals, for the first time, that in most cases, the values of $e{q}_{mathrm{el}}$ and $e{q}_{mathrm{latt}}(1ensuremath{-}{ensuremath{gamma}}_{ensuremath{infty}})$ could be connected by a universal correlation according to which $e{q}_{mathrm{el}}=ensuremath{-}Ke{q}_{mathrm{latt}}(1ensuremath{-}{ensuremath{gamma}}_{ensuremath{infty}})$, $|K|ensuremath{approx}3$ for moderate values of $e{q}_{mathrm{latt}}(1ensuremath{-}{ensuremath{gamma}}_{ensuremath{infty}})$. Based on this universal correlation curve, a number of ${e}^{2}mathrm{qQ}$ values, whose signs are yet undetermined, have been phenomenologically examined and their signs predicted. These general systematics, especially the universality of the correlation of the electronic gradient with the ionic gradient $e{q}_{mathrm{latt}}(1ensuremath{-}{ensuremath{gamma}}_{ensuremath{infty}})$, and its dependence on the ${ensuremath{gamma}}_{ensuremath{infty}}$ of the impurity, is unexpected in the framework of current theoretical models of the EFG in noncubic metals." @default.
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• W2023278926 title "Sign and magnitude of the quadrupole interaction of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>Cd</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>111</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>in noncubic metals: Universal correlation of ionic and electronic field gradients" @default.
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• W2023278926 doi "https://doi.org/10.1103/physrevb.13.2835" @default.
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