INFLUENCE OF HYDROGEN ORDERING ON THE PROTON SPIN-LATTICE RELAXATION TIME IN LANTHANUM SUPERSTOICHIOMETRIC DIHYDRIDES LaH2+c
The influence of hydrogen ordering processes on the temperature dependence of the proton spin-lattice relaxation time T1(T) in lanthanum hydrides is estimated. It is shown that on taking into account the dipole-dipole interaction of hydrogen and metal atoms, and the interaction of hydrogen atoms with conduction electrons, an excellent description of the experimental T1(T) dependence can be obtained. It is shown as well that spatial redistribution of ordering octa-hydrogen atoms induces a negligibly small changes in the calculated T1(T) dependence, as the major part of the dipole-dipole interaction is related with the unchanged totalities of tetra-hydrogens and metal atoms.
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