Commensurate Fluctuations in the Pseudogap and Incommensurate spin-Peierls Phases of TiOCl

Details Commensurate Fluctuations in the Pseudogap and Incommensurate spin-Peierls Phases of TiOCl Commensurate Fluctuations in the Pseudogap and Incommensurate spin-Peierls Phases of TiOCl

2007-02-17

arxiv.org/abs/cond-mat/0702405v1

Physics

Condensed Matter

Strongly Correlated Electrons

To appear in Physical Review B: Rapid Communications. 5 pages

Scientific paper

X-ray scattering measurements on single crystals of TiOCl reveal the presence of commensurate dimerization peaks within both the incommensurate spin-Peierls phase and the so-called pseudogap phase above T_c2. This scattering is relatively narrow in Q-space indicating long correlation lengths exceeding ~ 100 A below T* ~ 130 K. It is also slightly shifted in Q relative to that of the commensurate long range ordered state at the lowest temperatures, and it coexists with the incommensurate Bragg peaks below T_c2. The integrated scattering over both commensurate and incommensurate positions evolves continuously with decreasing temperature for all temperatures below T* ~ 130 K.

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