La Tour des Sels de Bechgaard

Brown, Stuart; Chaikin, P. M.; Naughton, Michael

doi:10.1007/978-3-540-76672-8_5

Cited by 18 publications

(15 citation statements)

References 123 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The signatures of quantum criticality have been chiefly revealed by the observation of linear-T resistivity 27 , whose strength scales with the distance from the quantum critical point (QCP) along the pressure axis. Among other fingerprints of quantum criticality, linear resistivity was also found to scale with the amplitude of SDW fluctuations seen by NMR and with the size of the critical temperature T c for superconductivity 25,[28][29][30] . The contributions of the renormalization group (RG) approach to the understanding of these quantum critical features have been the purpose of several works in the past [31][32][33] .…”

Section: Introductionmentioning

confidence: 90%

See 1 more Smart Citation

Seebeck coefficient in correlated low-dimensional organic metals

Shahbazi

Bourbonnais

2016

Phys. Rev. B

View full text Add to dashboard Cite

We study the influence of inelastic electron-electron scattering on the temperature variation of the Seebeck coefficient in the normal phase of quasi-one-dimensional organic superconductors. The theory is based on the numerical solution of the semi-classical Boltzmann equation for which the collision integral equation is solved with the aid of the electronic umklapp scattering vertex calculated by the renormalization group method. We show that the one-loop renormalization group flow of momentum and temperature dependent umklapp scattering, in the presence of nesting alterations of the Fermi surface, introduce electron-hole asymmetry in the energy dependence of the anisotropic scattering time. This is responsible for the enhancement of the Seebeck coefficient with respect to the band T -linear prediction and even its sign reversal around the quantum critical point of the phase diagram, namely where the interplay between antiferromagnetism and superconductivity along with the strength of spin fluctuations are the strongest. Comparison of the results with available data on low dimensional organic superconductors is presented and critically discussed.

show abstract

Section: Introductionmentioning

confidence: 90%

“…5 and 7. It is worth stressing that NMR experiments for the temperature variation of the nuclear spin lattice relaxation rate have brought considerable evidence for the presence of spin fluctuations for both compounds in the same temperature range and their amplitude with pressure 25,28,29,41,61,62 .…”

Section: B the Bechgaard Salts (Tmtsf)2xmentioning

confidence: 99%

Seebeck coefficient in correlated low-dimensional organic metals

Shahbazi

Bourbonnais

2016

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Especially in quasi-one-dimensional (Q1D) systems, various types of phase transitions have been found experimentally, triggering numerous theoretical works [3]. Among the typical examples are families of TM 2 X [4,5] and DCNQI 2 X [6], whose electronic structures are Q1D because of the stacking nature of the planar TM/DCNQI molecules and anisotropic shape of molecular orbital (MO). TM representing TMTSF (tetramethyltetraselenafulvalene) or TMTTF (tetramethyltetrathiafulvalene) molecules form crystals with different monovalent anions X − , then a three quarter-filled HOMO band of TM molecule is realized, i.e., quarter-filled in terms of holes; on the other hand in the DCNQI (N, N ′ -dicyanoquinonediimine) salts, when their counterparts are monovalent cations X + such as Ag and Li, a quarter-filled LUMO band of DCNQI is realized.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Studies on Phase Transitions in Quasi-One-Dimensional Molecular Conductors

2012

View full text Add to dashboard Cite

A review is given for recent theoretical studies on phase transitions in quasi-one-dimensional molecular conductors with a quarter-filled band. By lowering temperature, charge transfer salts exhibit a variety of transitions accompanying symmetry breaking, such as charge ordering, lattice dimerization, antiferromagnetic transition, spin-Peierls distortion, and so on. Analyses on microscopic quasi-one-dimensional models provide their systematic understandings, by the complementary use of different analytical and numerical techniques; they can reproduce finite-temperature phase transitions, whose results can be directly compared with experiments and give feedbacks to material design.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

La Tour des Sels de Bechgaard

Cited by 18 publications

References 123 publications

Seebeck coefficient in correlated low-dimensional organic metals

Seebeck coefficient in correlated low-dimensional organic metals

Theoretical Studies on Phase Transitions in Quasi-One-Dimensional Molecular Conductors

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

Contact Info

Product

Resources

About