APPLICATION OF HG-199 SOLID-STATE NMR TO HG BASED HTSC

It is proposed to study Hg-oxide ceramics, which are high-temperature superconductors, with Hg-199 NMR spectroscopy. As an exemplary applica tion of this method first room-temperature Hg-199 spectra and spin-lat tice relaxation times of samples with different macrostructure are pre sented. A spin-lattice relaxation time of T1 = 35 ms is found. All sam ples exhibit similar characteristic powder spectra caused by an axiall y symmetric Hg-199 spin interaction. The isotropic value and the aniso tropy of the tensor relative to solid HgCl2 as a standard substance is estimated.