The observation of lattice distortion in TiOBr by using synchrotron X-rays diffraction

TiOBr has the same structure of TiOCl, and the physical properties of TiOBr were very similar to that of TiOCl. These systems attract attention as the new candidate of spin-Peierls transition accompanying orbital ordering. We performed the specific heat measurement, magnetization measurement and $\mu $SR measurement, and checked that it was the candidate of a spin-Peierls transition. However, lattice modification of TiOBr has not been observed directly before. Therefore, in this study, the X-rays diffraction measurement was performed at BL46XU of SPring-8, Japan. It succeeded in observation of the super-lattice spot by lattice modification of TiOBr, and succeeded also in observation of the temperature change. Furthermore, we investigate the superlattice structure.