Pressure-induced spin-Peierls to incommensurate charge-density-wave transition in the ground state of TiOCl.
The ground state of the spin-Peierls system TiOCl was probed using synchrotron X-ray diffraction on a single crystal sample at T=6 K. We tracked the evolution of the structural superlattice peaks associated with the dimerized ground state as a function of pressure. The dimerization along the b axis is rapidly supressed in the vicinity of a first-order structural transition a P{sub c}=13.1(1) GPa. The high-pressure phase is characterized by an incommensurate charge-density wave perpendicular to the original spin-chain direction. These results show that the electronic ground state undergoes a fundamental change in symmetry, indicating a significant change in the principal interactions.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 982647
- Report Number(s):
- ANL/XSD/JA-64871; TRN: US1005354
- Journal Information:
- Phys. Rev. B, Vol. 81, Issue May 15, 2010
- Country of Publication:
- United States
- Language:
- ENGLISH
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