Energy and Dielectric Relaxations in Bechgaard–Fabre Salts

Monçeau, P.; Lasjaunias, J.C.; Biljaković, Katica; Nad, F.

doi:10.1007/978-3-540-76672-8_10

Cited by 4 publications

(2 citation statements)

References 81 publications

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“…In the universal phase diagram of these series, the (TMTTF) 2 X are Mott insulators that develop a charge ordered (CO) state [2,3]. This state is followed at lower temperature by either an antiferromagnetic Néel or a lattice distorted spin-Peierls (SP) phase.…”

Section: Introductionmentioning

confidence: 99%

Microwave dielectric study of spin-Peierls and charge-ordering transitions in(TMTTF)2PF6salts

et al. 2010

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We report a study of the 16.5 GHz dielectric function of hydrogenated and deuterated organic salts (TMTTF)2PF6. The temperature behavior of the dielectric function is consistent with short-range polar order whose relaxation time decreases rapidly below the charge ordering temperature. If this transition has more a relaxor character in the hydrogenated salt, charge ordering is strengthened in the deuterated one where the transition temperature has increased by more than thirty percent. Anomalies in the dielectric function are also observed in the spin-Peierls ground state revealing some intricate lattice effects in a temperature range where both phases coexist. The variation of the spin-Peierls ordering temperature under magnetic field appears to follow a mean-field prediction despite the presence of spin-Peierls fluctuations over a very wide temperature range in the charge ordered state of these salts.

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Section: Introductionmentioning

confidence: 99%

Microwave dielectric study of spin-Peierls and charge-ordering transitions in(TMTTF)2PF6salts

et al. 2010

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“…The sulfur series of quasi-one-dimensional (1D) organic compounds (TMTTF) 2 X with the centro-symmetrical anions X = PF 6 , AsF 6 , SbF 6 ... are Mott insulators which develop a charge ordered (CO) state [1][2][3] that is followed at lower temperature by either an antiferromagnetic (AF) Néel or a lattice distorted spin-Peierls (SP) phase depending on the pressure applied, anion X substitution, and to some degree the deuteration of the methyl groups. In low pressure conditions, these (TMTTF) 2 X salts stand out as model low-dimensional systems to study the competition between spin, charge, and lattice degrees of freedom.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelastic coupling in the spin-Peierls ground state of hydrogenated and deuterated (TMTTF)2PF6salts

et al. 2012

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We report an ultrasonic study of the magneto-elastic coupling of the hydrogenated and deuterated (TMTTF)2PF6 organic salts. For both salts the temperature dependence of the longitudinal velocity along the c * axis displays a monotonic stiffening of the C33 compressibility modulus upon cooling. Below the characteristic temperature scale 40 K the modulus stiffening becomes markedly enhanced, in concomitance with the reduction of spin degrees of freedom previously seen in magnetic measurements as low dimensional precursors of the spin-Peierls transition. The magneto-elastic coupling appears to be much weaker in the hydrogenated salt due to the highly inhomogeneous elastic behavior induced by the proximity of the charge ordering transition to the spin-Peierls phase. For the deuterated salt, an important anomaly in the ultrasound velocity is observed below the spin-Peierls transition temperature TSP in agreement with scaling of the elastic deformation with the spin-Peierls order parameter. In spite of the weakly inhomogeneous character of the spin-Peierls phase transition, the magnetic field dependence of TSP is well captured with the mean-field prediction for the lattice distorted Heisenberg spin chain.

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