Completely hydrostatic pressure effect of anisotropic resistivity in the 1-D organic conductor (TMTTF)2SbF6

Itoi, M; Ishii, Yasuyuki; Takekoshi, Shuho; Kitano, Haruhisa; Matsubayashi, Kazuyuki; Uwatoko, Yoshiya; Nakamura, Toshikazu

doi:10.1016/j.physc.2009.11.138

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…From our recalibrated data we obtain a renormalized slope d / = − T p d 15.6 CO K kbar −1 for (TMTTF) 2 SbF 6 and −36 K kbar −1 for (TMTTF) 2 AsF 6 . These values are in good agreement with previous reports based on pressuredependent resistivity measurements [51][52][53].…”

Section: Phase Diagramsupporting

confidence: 93%

Pressure-dependent optical investigations of Fabre salts in the charge-ordered state

Voloshenko

Herter²,

Beyer³

et al. 2017

J. Phys.: Condens. Matter

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In a comprehensive infrared study, the molecular vibrational features of (TMTTF)SbF, (TMTTF)AsF and (TMTTF)PF single crystals have been measured down to temperatures as low as 7 K by applying hydrostatic pressure up to 11 kbar. We follow the charge disproportionation below the critical temperatures T as pressure increases, and determine the critical pressure values p at which the charge-ordered phase is suppressed. The coexistence of the spin-Peierls phase with charge order is explored at low temperatures, and the competition of these two phases is observed. Based on our measurements we construct a generic phase diagram of the Fabre salts with centrosymmetric anions. The pressure-dependent anion and methyl-group dynamics in these quasi-one-dimensional charge transfer compounds yields information about the interplay of the organic molecules in the stacks and the anions, and how this interaction varies upon the transition to the charge-ordered state.

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Section: Phase Diagramsupporting

confidence: 93%

Pressure-dependent optical investigations of Fabre salts in the charge-ordered state

Voloshenko

Herter²,

Beyer³

et al. 2017

J. Phys.: Condens. Matter

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“…In (TMTTF) 2 SbF 6 , the behaviors of the AF and CO transitions under low pressures below 5 kbar have been established [30]. Above the T CO , a metal-insulator crossover has been reported [4,[57][58][59][60]. Figure 9 shows a phase diagram of (TMTTF) 2 SbF 6 that summarizes the results of the present study.…”

Section: E Phase Diagramsupporting

confidence: 69%

13C NMR study of the magnetic properties of the quasi-one-dimensional conductor, (TMTTF)2SbF6

Iwase,

Sugiura,

Furukawa

et al. 2011

Preprint

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Magnetic properties in the quasi-one-dimensional organic salt (TMTTF)2SbF6 are investigated by 13 C NMR under pressures. Antiferromagnetic phase transition at ambient pressure (AFI) is confirmed. Charge-ordering is suppressed by pressure and is not observed under 8 kbar. For 5 < P < 20 kbar, a sharp spectrum and the rapid decrease of the spin-lattice relaxation rate 1/T1 were observed below about 4 K, attributed to a spin-gap transition. Above 20 kbar, extremely broadened spectrum and critical increase of 1/T1 were observed. This indicates that the system enters into another antiferromagnetic phase (AFII) under pressure. The slope of the antiferromagnetic phase transition temperature TAFII, dTAFII/dP , is positive, while TAFI decreases with pressure. The magnetic moment is weakly incommensurate with the lattice at 30 kbar.

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“…Charge order is supposed to be driven by the effective Coulomb repulsion V between neighboring molecules with respect to the bandwidth W = 2t. Since both parameters depend on the intersite distance, the charge-order transition temperature T CO can be tuned by applying physical [13,[49][50][51][52][53] as well as by chemical pressure [7,37]. As an example, the temperature-dependent resistivity of (TMTTF) 2 SbF 6 is plotted in Figure 2b with increasing hydrostatic pressure up to 10 kbar.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Optical Investigations of Charge Order in Organic Chain Compounds (TMTTF)2X

et al. 2012

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Charge ordering in the (TMTTF) 2 X salts with centrosymmetric anions (X = PF − 6 , AsF − 6 , SbF − 6 ) leads to a ferroelectric state around 100 K. For the first time and in great completeness, the intra-and intermolecular vibrational modes of (TMTTF) 2 X have been investigated by infrared and Raman spectroscopy as a function of temperature and pressure for different polarizations. In this original paper, we explore the development and amount of charge disproportionation and the coupling of the electronic degrees of freedom to the counterions and the underlying lattice. The methyl groups undergo changes with temperature that are crucial for the anion cage formed by them. We find that the coupling of the TMTTF molecules to the hexafluorine anions changes upon cooling and especially at the charge-order transition, indicating a distortion of the anion. Additional features are identified that are caused by the anharmonic potential. The spin-Peierls transition entails additional modifications in the charge distribution. To complete the discussion, we also add the vibrational frequencies and eigenvectors based on ab-initio quantum-chemical calculations.

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Completely hydrostatic pressure effect of anisotropic resistivity in the 1-D organic conductor (TMTTF)2SbF6

Cited by 6 publications

References 9 publications

Pressure-dependent optical investigations of Fabre salts in the charge-ordered state

Pressure-dependent optical investigations of Fabre salts in the charge-ordered state

13C NMR study of the magnetic properties of the quasi-one-dimensional conductor, (TMTTF)2SbF6

Comprehensive Optical Investigations of Charge Order in Organic Chain Compounds (TMTTF)2X

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