Magnetic Properties of Bechgaard Salts and Related Compounds Role of the Electronic Localization

Coulon, C.

doi:10.1007/978-1-4899-2091-1_14

Cited by 9 publications

(6 citation statements)

References 43 publications

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“…By the classical electrooxidation technique, single crystals of stoichiometry 2-1 are grown when they are associated with a monovalent diamagnetic anion (Laversanne, 1987). A summary of the structural and physical properties of the selected salts is presented Table 1 and a recent review on the electronic and magnetic properties of these salts has been given by Coulon (1987).…”

Section: Methodsmentioning

confidence: 99%

Optical properties of radical cation salts derived from the TTF molecule: Evidence for electronic correlations and phase transitions in organic conductors

Delhaès

Garrigou‐Lagrange

1988

Phase Transitions

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Following a general presentation of the organic conductors which belong to the series of radical cation salts derived from the tetrathiafulvalene molecule we analyze the characteristic charge transfer absorption bands observed in these mixed valence compounds. Using a Drude-Lorentz model we show that the energy gap present in these materials is basically of the Hubbard type. Nevertheless we observe also in specific cases additional contributions due to either a periodic lattice distortion or a counter-ion electrostatic perturbation. We conclude finally that the electronic correlations are the dominant interactions in these narrow Id electronic band systems.

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Section: Methodsmentioning

confidence: 99%

Optical properties of radical cation salts derived from the TTF molecule: Evidence for electronic correlations and phase transitions in organic conductors

Delhaès

Garrigou‐Lagrange

1988

Phase Transitions

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“…The magnetic susceptibility of these salts is only slightly temperature dependent (ie. gapless) in the paramagnetic phase (Coulon, 1987). This means that the magnetic degrees of freedom are not affected by the localisation.…”

Section: Physical Properties O F Samples Of Type Imentioning

confidence: 92%

“…Among these materials are the well known TMTTF and TMTSeF salts (also called Bechgaard salts) but also many other compounds (Coulon, 1987). Figure 1 shows two different views of a typical structure.…”

Section: Physical Properties O F Samples Of Type Imentioning

confidence: 98%

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Magnetic phase transitions in bechgaard salts and related compounds: Electronic localisation and interchain couplings

Vaca

Coulon

1991

Phase Transitions

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The physical properties of Bechgaard salts and related compounds are quickly described when an electronic localisation is present. In this case, the low-temperature ground state results in a competition between two instabilities: a Spin-Peierls distortion and an antiferromagnetic ordering. 1D theory results are compared with experimental data to show that the electronic localisation is not the only relevant parameter which drives this competition. The need for a quasi-1D theory is demonstrated with the introduction of relevant interchain couplings. The nature of these couplings is discussed to show that the Spin-Peierls ground state does not appear frequently, in agreement with experiment.

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“…Literature on the theory of the SP transition is already quite vast. We mention two earlier review articles by Bray et al [1] and by Buzdin and Bulaevskii [2] as extensive introductions, and the review on the phase I-lamiltonian approach by Fukuyama and Takayama [3] Of the few compounds, in which a spin-Peierls transition is well established: TTFAuBDT, TTF-CuBDT [4,5], MEM-TCNQ [6], and (TMTTF)2PF8 [7], especially TTF-AuBDT is a suitable candidate to study the intermediate phase. Its low zero-field critical temperature of 2 K implies a critical field of only 2 T, hence large values of B/Be are within reach.…”

Section: Introductionmentioning

confidence: 99%

Spin-Peierls transition in an incommensurately modulated system

Kramer

Brom

1988

Synthetic Metals

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Under certain conditions uniform magnetic chains are known to be unstable for a lattice dimerization modulating the exchange integral, i.e. the spin-Peierls (SP) transition. In sufficiently high fields a SP system enters a magnetic discommensuration (MD) state incommensurate with the underlying lattice, characterized by the presence of midgap states.The question is raised, what happens in those magnetic systems that are not uniform from the beginning. Based on experimental evidence obtained in triclinic DMM-TCNQ2, it will be argued that in zero field there is an instability for a lattice modulation, that approaches the dimerization wave vector via a multiple of the original modulation vector. In sufficiently high fields the so created midgap band becomes magnetic field dependent, like the MD-phase of a regular SP-system.

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Magnetic Properties of Bechgaard Salts and Related Compounds Role of the Electronic Localization

Cited by 9 publications

References 43 publications

Optical properties of radical cation salts derived from the TTF molecule: Evidence for electronic correlations and phase transitions in organic conductors

Optical properties of radical cation salts derived from the TTF molecule: Evidence for electronic correlations and phase transitions in organic conductors

Magnetic phase transitions in bechgaard salts and related compounds: Electronic localisation and interchain couplings

Spin-Peierls transition in an incommensurately modulated system

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