Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-08-04
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures
Scientific paper
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 Pc = 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.
Feng Yejun
Helton Joel S.
Lee Young Sam
Prodi Andrea
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