Titan(III)‐oxychlorid

Schäfer, Harald; Weise, Eberhard; Wartenpfuhl, Friedel

doi:10.1002/ange.19570691313

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“…Materials and crystal growth. The single crystals of TiOCl were grown by the chemical vapor transport method from TiCl 3 and TiO 2 in a closed quartz tube into a temperature gradient [7,39].…”

Section: Methodsmentioning

confidence: 99%

High pressure x-ray study of spin-Peierls physics in the quantum spin chain material TiOCl

Rotundu,

Wen,

et al. 2017

Preprint

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The application of pressure can induce transitions between unconventional quantum phases in correlated materials. The inorganic compound TiOCl, composed of chains of S=1/2 Ti ions, is an ideal realization of a spin-Peierls system with a relatively simple unit cell. At ambient pressure, it is an insulator due to strong electronic interactions (a Mott insulator). Its resistivity shows a sudden decrease with increasing pressure, indicating a transition to a more metallic state which may coincide with the emergence of charge density wave order. Therefore, high pressure studies of the structure with x-rays are crucial in determining the ground-state physics in this quantum magnet. In ambient pressure, TiOCl exhibits a transition to an incommensurate nearly dimerized state at T c2 = 92 K and to a commensurate dimerized state at T c1 = 66 K. Here, we discover a rich phase diagram as a function of temperature and pressure using x-ray diffraction on a single crystal in a diamond anvil cell down to T = 4 K and pressures up to 14.5 GPa. Remarkably, the magnetic interaction scale increases dramatically with increasing pressure, as indicated by the high onset temperature of the spin-Peierls phase. At ∼7 GPa, the extrapolated onset of the spin-Peierls phase occurs above T = 300 K, indicating a quantum singlet state exists at room temperature.Further comparisons are made with the phase diagrams of related spin-Peierls systems that display metallicity and superconductivity under pressure.

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Section: Methodsmentioning

confidence: 99%