Phase diagrams TMTTF

Figure 1.19. Generic T-P phase diagram for BFS. The origin on the pressure axis is arbitrarily set for (TMTTF)2PF6. MH, Mott-Hubbard M, Metal SP, Spin-Peierls AF, Antiferromagnetic SDW, Spin-Density-Wave SC, Superconductor. Adapted from Auban-Senzier J6rome, 2003.

Fig. 13 Generalized phase diagram for the (TMTSF)2X and (TMTTF)2X by Jerome [195]. CL, SP, SDW, and SC refer to charge-localized (which corresponds to charge-ordered state), sprn-Peierls, spin density wave, and superconducting states, respectively, (a) (TlVrrTF)2PF6, (b) (TMTTF>2Br, (c) (TMTSF)2PF6, (d) (TMTSF)2C104...

Temperature-pressure phase diagram of TMTSF and TMTTF salts [30]. 

When magnitude of the electron-electron Coulomb interaction increases, the system is expected to show a ehange from the SDW dominated state to the spin-Peierls one. This was verified in another system, (TMTTF(tetramethyltetra-thiafulvalene))2X and (TMTSF)2X [74]. The former materials have the narrower band width than the latter. This means that the role of Coulomb interaction is more important in the former system than in the latter. The former system is expected to have the spin-Peierls state and the latter one the SDW state. Systematic studies have proposed the phase diagram shown in Fig. 23 [74]. 

Figure 23 Schematic phase diagram of the (TMTTF, TMTSF)2X system. (Reproduced from D. Jerome, Organic Conductors, Ed. J-P. Farge (Marcel Dekker, 1994) p. 420, Fig.

TMTCF denotes TMTTF or TMTSF molecule. The amount of charge transfer in this family with one-dimensional structures is such TMTCF " and X . The band structure and the Fermi surface are open as shown in Fig. 29 for the case of (TMTTF)2X [94]. The phase diagram of this family on the plane of pressure (p) and temperature (7) is shown in Fig. 30 proposed by Jerome [95]. The major... 

A generalized T-P phase diagram, which includes not only the TMTSF system but also TMTTF ID metals and insulators, describing the variety of ground states (spin-Peierls, SDW, and SC states), has been proposed. 

Figure 3.13. Phase diagram T,P,x) for different ground states found experimentally in [(TMTTF)jc (TMTSF), 42(C104) alloys [333].

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