Interacting Electrons in Quasi-One-Dimensional Organic Superconductors

Bourbonnais, C.; Jérôme, D.

doi:10.1007/978-3-540-76672-8_12

Cited by 41 publications

(41 citation statements)

References 198 publications

(318 reference statements)

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“…The situation differs slightly for the (TMTTF) 2 PF 6 salts considered here. The insulating gap is actually relatively small [22,27] and the spins weakly localized [1], so that the maximum in susceptibility is pushed above room temperature [7,8] and so will be the maximum of the elastic softening. Thus the monotonic decay of spin susceptibility appears consistent with the regular increase of sound velocity with decreasing temperature below 140 K (see Fig.…”

Section: Resultsmentioning

confidence: 99%

“…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%

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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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Section: Resultsmentioning

confidence: 99%

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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“…Deconfinement transitions are investigated in organics [42,45] but the inter-chain hopping also clearly plays a crucial role in systems such as purple bronze [5]. Both these systems still have a poorly understood superconducting phase in the higher-dimensional regime.…”

Section: Deconfinement Transitionmentioning

confidence: 99%

Quantum Criticality and the Kondo Lattice

Giamarchi¹

2010

Understanding Quantum Phase Transitions

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“…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

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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.

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Interacting Electrons in Quasi-One-Dimensional Organic Superconductors

Cited by 41 publications

References 198 publications

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

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

Quantum Criticality and the Kondo Lattice

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

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