A1 Refereed original research article in a scientific journal
H-2 NMR in nearly stoichiometric yttrium dideuteride
Authors: Zogal OJ, Vuorimaki AH, Ylinen EE
Publisher: SPRINGER VERLAG
Publication year: 1999
Journal:: European Physical Journal B: Condensed Matter and Complex Systems
Journal name in source: EUROPEAN PHYSICAL JOURNAL B
Journal acronym: EUR PHYS J B
Volume: 10
Issue: 2
First page : 201
Last page: 207
Number of pages: 7
ISSN: 1434-6028
DOI: https://doi.org/10.1007/s100510050846
Abstract
H-2 NMR spectra and spin-lattice relaxation rates: R-1 are measured as functions of temperature (4.2-310 K) for YD1.99 and YD1.99+0.04 In YD1.99 the measured temperature dependence of R1 is explained by the interaction of deuteron spins with conduction electrons and the value 7.56 x 10(-5) s(-1) K-1 is obtained for the inverse Korringa product R-1e/T. Most of she spectral features in the "rigid" lattice regime are described by the dipolar interaction. No evidence of the deuterium self-diffusion was observed in the measured temperature range. The low-temperature spectra ill YD1.99+0.04 consisted of two components: a central line and a doublet characteristic for the quadrupole interaction. The central line corresponds to zero electric field gradients (EFG) at the sites of the deuterons which have a surrounding: with cubic symmetry like in YD1.99 The doublet indicates a non-zero EFG which can be explained in terms of the presence of short-range ordered domains of the hypothetical YD2.25 stoichiometry. Other possible interpretations of the spectra are also discussed. In the vicinity of 250 K both spectra and R-1 reflect the onset of the rapid motion of deuterium atoms. The linear dependence of R-1 at low temperatures yields R-1e/T = 6.35 x 10(-5) s(-1) K-1.
H-2 NMR spectra and spin-lattice relaxation rates: R-1 are measured as functions of temperature (4.2-310 K) for YD1.99 and YD1.99+0.04 In YD1.99 the measured temperature dependence of R1 is explained by the interaction of deuteron spins with conduction electrons and the value 7.56 x 10(-5) s(-1) K-1 is obtained for the inverse Korringa product R-1e/T. Most of she spectral features in the "rigid" lattice regime are described by the dipolar interaction. No evidence of the deuterium self-diffusion was observed in the measured temperature range. The low-temperature spectra ill YD1.99+0.04 consisted of two components: a central line and a doublet characteristic for the quadrupole interaction. The central line corresponds to zero electric field gradients (EFG) at the sites of the deuterons which have a surrounding: with cubic symmetry like in YD1.99 The doublet indicates a non-zero EFG which can be explained in terms of the presence of short-range ordered domains of the hypothetical YD2.25 stoichiometry. Other possible interpretations of the spectra are also discussed. In the vicinity of 250 K both spectra and R-1 reflect the onset of the rapid motion of deuterium atoms. The linear dependence of R-1 at low temperatures yields R-1e/T = 6.35 x 10(-5) s(-1) K-1.
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