Electron-lattice coupling and the broken symmetries of the molecular salt (TMTTF)$_2$SbF$_6$

Details Electron-lattice coupling and the broken symmetries of the molecular salt (TMTTF)$_2$SbF$_6$ Electron-lattice coupling and the broken symmetries of the molecular salt (TMTTF)$_2$SbF$_6$

2004-05-28

arxiv.org/abs/cond-mat/0405683v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.70.121101

(TMTTF)$_2$SbF$_6$ is known to undergo a charge ordering (CO) phase transition at $T_{CO}\approx156K$ and another transition to an antiferromagnetic (AF) state at $T_N\approx 8K$. Applied pressure $P$ causes a decrease in both $T_{CO}$ and $T_N$. When $P>0.5 GPa$, the CO is largely supressed, and there is no remaining signature of AF order. Instead, the ground state is a singlet. In addition to establishing an expanded, general phase diagram for the physics of TMTTF salts, we establish the role of electron-lattice coupling in determining how the system evolves with pressure.

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