Deconfinement transition and dimensional crossover in the Bechgaard-Fabre salts: pressure- and temperature-dependent optical investigations

Abstract

The infrared response of the organic conductor (TMTSF)${}_2$PF${}_6$ and the Mott insulator (TMTTF)${}_2$PF${}_6$ are investigated as a function of temperature and pressure and for the polarization parallel and perpendicular to the molecular stacks. By applying external pressure on (TMTTF)${}_2$PF${}_6$, the Mott gap rapidly diminishes until the deconfinement transition occurs when the gap energy is approximately twice the interchain transfer integral. In its deconfined state (TMTTF)${}_2$PF${}_6$ exhibits a crossover from a quasi-one-dimensional to a higher-dimensional metal upon reducing the temperature. For (TMTSF)${}_2$PF${}_6$ this dimensional crossover is observed either with increase in external pressure or with decrease in temperature. We quantitatively determine the dimensional crossover line in the pressure-temperature diagram based on the degree of coherence in the optical response perpendicular to the molecular stacks.

12 pages, 15 figures

References in corpus (7)

• Deconfinement transition and Luttinger to Fermi Liquid crossover in quasi one-dimensional systems
• Pressure-induced deconfinement of the charge transport in the quasi-one-dimensional Mott insulator (TMTTF)_2AsF_6
• Breakup of the Fermi surface near the Mott transition in low-dimensional systems
• Pressure-induced insulator-to-metal transition in low-dimensional TiOCl
• Conduction Anisotropy, Hall Effect, and Magnetoresistance of (TMTSF)2ReO4 at High Temperatures
• Pressure-induced structural phase transition in the Bechgaard-Fabre salts
• From Luttinger to Fermi liquids in organic conductors

Cited by in corpus (15)

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• Organic Superconductors: when correlations and magnetism walk in
• Some experimental tests of Tomonaga-Luttinger liquids
• Correlation-driven electronic multiferroicity in (TMTTF)${}_2$-$X$ organic crystals
• Dimensional-crossover-driven Mott transition in the frustrated Hubbard model
• Low temperature structural effects in the (TMTSF)${}_2$PF${}_6$ and AsF${}_6$ Bechgaard salts
• Spin and charge dynamics of a quasi-one-dimensional antiferromagnetic metal
• Polarization-dependent infrared reflectivity study of Sr${}_{2.5}$Ca${}_{11.5}$Cu${}_{24}$O${}_{41}$ under pressure: Charge dynamics, charge distribution, and anisotropy
• The Future of the Correlated Electron Problem
• The optical conductivity for a spin-Peierls ground state of (TMTTF)${}_2$PF${}_6$ with tetramer formation