https://doi.org/10.1007/s100510050846
2H NMR in nearly stoichiometric yttrium dideuteride
1
W. Trzebiatowski Institute for Low Temperature and Structure Research, Polish Academy
of Sciences,
ul. Okólna 2, 50-950 Wroclaw, Poland
2
Wihuri Physical Laboratory, Department of Physics, University of Turku, 20014 Turku,
Finland
Corresponding author: a zogal@highscreen.int.pan.wroc.pl
Received:
8
September
1998
Published online: 15 July 1999
2H NMR spectra and spin-lattice relaxation rates, R1 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 
s-1 K-1 is
obtained for the inverse Korringa product 
. Most of the 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 in 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 R1
reflect the onset of the rapid motion of deuterium atoms. The linear dependence of
R1 at low temperatures yields 
s-1 K-1.
PACS: 61.66.Fn – Inorganic compounds / 61.18.Fs – Magnetic resonance techniques; Mössbauer spectroscopy / 76.60.-k – Nuclear magnetic resonance and relaxation
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
