Abstract
Spin excitations in the linear chains of localized titanium 3d z2 electrons are held responsible for the weak, temperature-independent static magnetic susceptibility of β-TiCl 3. Dynamic susceptibility measurements (ESR) fail to indicate any temperature-independent contribution to the susceptibility, and instead show a strongly temperature-dependent susceptibility. This discrepancy is attributed to the fact that in ESR only the unpaired electrons at titanium sites on the surface of β-TiCl 3, at the end of the one-dimensional chains, can be detected. The peculiar temperature dependence observed is ascribed to stress relaxation of two kinds of chain-end site. Both can occur in a ground-state nuclear configuration, in which ESR is observable, and in an excited nuclear configuration, in which it is not observable. Effects observed after adsorption of gases onto the surface are briefly discussed.
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