Pressure-induced spin-Peierls to incommensurate charge-density-wave transition in the ground state of TiOCl
Author(s)Lee, Young S.; Prodi, A.; Helton, Joel S.; Feng, Yejun
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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 suppressed in the vicinity of a first-order structural phase transition at P[subscript 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.
DepartmentMIT Materials Research Laboratory; Massachusetts Institute of Technology. Department of Physics
Physical Review B
American Physical Society
Prodi, A. et al. “Pressure-induced spin-Peierls to incommensurate charge-density-wave transition in the ground state of TiOCl.” Physical Review B 81.20 (2010): 201103. © 2010 The American Physical Society.
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