Influence of Charge Order on the Ground States of TMTTF Molecular Salts

Details Influence of Charge Order on the Ground States of TMTTF Molecular Salts Influence of Charge Order on the Ground States of TMTTF Molecular Salts

2003-12-16

arxiv.org/abs/cond-mat/0312387v1

Physics

Condensed Matter

Strongly Correlated Electrons

5pages, 5 figures, Proceeding of ISCOM2003, to appear in Journal de Physique IV

Scientific paper

10.1051/jp4:2004114006

(TMTTF)2AsF6 and (TMTTF)2SbF6 are both known to undergo a charge ordering phase transition, though their ground states are different. The ground state of the first is Spin-Peierls, and the second is an antiferromagnet. We study the effect of pressure on the ground states and the charge-ordering using 13C NMR spectroscopy. The experiments demonstrate that the the CO and SP order parameters are repulsive, and consequently the AF state is stabilized when the CO order parameter is large, as it is for (TMTTF)2SbF6. An extension of the well-known temperature/pressure phase diagram is proposed.

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