Competition and coexistence of bond and charge orders in (TMTTF)2AsF6

Details Competition and coexistence of bond and charge orders in (TMTTF)2AsF6 Competition and coexistence of bond and charge orders in (TMTTF)2AsF6

2002-05-02

arxiv.org/abs/cond-mat/0205026v1

Phys. Rev. B, vol. 66, 081103(R) (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.66.081103

(TMTTF)2AsF6 undergoes two phase transitions upon cooling from 300 K. At Tco=103 K a charge-ordering (CO) occurs, and at Tsp(B=9 T)=11 K the material undergoes a spin-Peierls (SP) transition. Within the intermediate, CO phase, the charge disproportionation ratio is found to be at least 3:1 from carbon-13 NMR 1/T1 measurements on spin-labeled samples. Above Tsp, up to about 3Tsp, 1/T1 is independent of temperature, indicative of low-dimensional magnetic correlations. With the application of about 0.15 GPa pressure, Tsp increases substantially, while Tco is rapidly suppressed, demonstrating that the two orders are competing. The experiments are compared to results obtained from calculations on the 1D extended Peierls-Hubbard model.

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