Electron-lattice coupling and broken symmetries of the molecular salt(TMTTF)2SbF6

2004/05/28 by Weiqiang Yu, W. Yu, F. Zhang +8 · 2 citations
Chemistry · Materials Science · Physics and Astronomy · #Inorganic Fluorides and Related Compounds #Magnetism in coordination complexes #Organic and Molecular Conductors Research #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.70.121101

4 pages, 5 figures

arxiv created 2004/05/28 · openalex publication_date 2004/09/08 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The temperature/pressure phase diagram for (TMTTF)₂SbF₆ is determined using ¹³C NMR spectroscopy. At ambient pressure, a transition to a charge-ordered (CO) state occurs at T_CO=156\phantom\rule0.3em0exK, and antiferromagnetic (AF) order is observed below T_N=8\phantom\rule0.3em0exK. Both are suppressed with pressure: when P>0.5\phantom\rule0.3em0exGPa, there is no evidence for CO, and the low-temperature ¹³C NMR spectrum is consistent with a singlet [spin-Peierls (SP)] ground state. At a given pressure, the temperature dependence of the CO order parameter is not monotonic, and provides an opportunity to identify what processes could be controlling the CO amplitude. ¹⁹F NMR spectroscopy provides empirical evidence that electron-counterion coupling is crucial to stabilizing the CO and AF phases.

Citations

• Influence of charge order on the ground states of TMTTF molecular salts

Cited by

• Finite-Temperature Phase Transitions in Quasi-One-Dimensional Molecular Conductors
• Finite-Temperature Phase Diagram of Quasi-One-Dimensional Molecular Conductors: Quantum Monte Carlo Study