Abstract
We report on a detailed single crystal x-ray diffraction study of the unconventional spin-Peierls compound TiOCl. The intermediate phase of TiOCl is characterized by an incommensurate modulation which is virtually identical to that recently found in the homologue compound TiOBr. The first order phase transition between the spin-Peierls ground state and the incommensurate phase reveals the same kind of thermal hysteresis in both its crystal structure and magnetic susceptibility. A weak, but significant magnetic field effect is found for this phase transition with a field induced shift of the transition temperature of $\ensuremath{\Delta}{T}_{c1}=\ensuremath{-}0.13\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ for an applied field of $B=10\phantom{\rule{0.3em}{0ex}}\mathrm{T}$ along the chain direction. The field induced changes of the incommensurate crystal structure are compatible with a scenario of competing intrachain and interchain interactions.
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