Abstract
We report on a novel relaxation mechanism of lithium defects in potassium chloride (KCl:Li). The dielectric loss was measured as a function of frequency and temperature for single crystals doped with different compositions of6Li and7Li. As a main result we find that, tunneling states associated with the heavier isotope7Li relax much faster than the ones due to6Li defects, contrary to what is expected for relaxation into the phonon system. This surprising isotope dependence can be understood in the framework of a novel relaxation mechanism, driven by the dipolar interaction and based on collective motion of the Li+ defects.
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