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- W2090065611 abstract "The $^{139}mathrm{La}$ nuclear magnetic resonances in the double-hexagonal close-packed (dhcp) form of metallic lanthanum have been studied by spin-echo techniques in the frequency range 6-30 MHz and temperatures between ensuremath{sim}1 and 210ifmmode^circelsetextdegreefi{}K. A seven-line powder pattern due to electric quadrupole interactions is observed with $|{e}^{2}q{Q}^{(139)}{h}^{ensuremath{-}1}|=7.8ifmmodepmelsetextpmfi{}0.3$ MHz. The quadrupole splittings are identical within the experimental uncertainty for the two crystallographic sites. The Knight shifts are very different, however, $Kensuremath{approx}+0.63% mathrm{and} +1.02%$ at 4ifmmode^circelsetextdegreefi{}K, and $Kensuremath{approx}+0.29% mathrm{and} +0.92%$ at 210ifmmode^circelsetextdegreefi{}K. The anisotropic Knight-shift contribution is estimated to be less than 10% of the measured shifts. The average spin-lattice relaxation time for the two sites is ${T}_{1}T=0.56ifmmodepmelsetextpmfi{}0.05$ sec ifmmode^circelsetextdegreefi{}K. The relaxation time for the site having the smaller Knight shift exceeds that for the other site by a factor of approximately 1.7. A comparison of the average Knight shifts and spinlattice relaxation rates in dhcp lanthanum with those in hcp scandium and yttrium leads to the conclusion that the direct $s$-contact interaction is the dominant magnetic-hyperfine mechanism in the Group-IIIB transition metals." @default.
- W2090065611 created "2016-06-24" @default.
- W2090065611 creator A5027562933 @default.
- W2090065611 date "1969-03-10" @default.
- W2090065611 modified "2023-09-25" @default.
- W2090065611 title "Nuclear Magnetic Resonance in Hexagonal Lanthanum Metal: Knight Shifts, Spin Relaxation Rates, and Quadrupole Coupling Constants" @default.
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- W2090065611 doi "https://doi.org/10.1103/physrev.179.359" @default.
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