M. Dumm

Evidence for spin–charge separation in quasi-one-dimensional organic conductors

Interacting conduction electrons are usually described within Fermi-liquid theory, which states that, in spite of strong interactions, the low-energy excitations are electron-like quasiparticles with charge and spin. In recent years there has been tremendous interest in conducting systems that are not Fermi liquids, motivated by the observation of highly anomalous metallic states in various materials, most notably the copper oxide superconductors. Non-Fermi-liquid behaviour is generic to one-dimensional interacting electron systems, which are predicted to be Luttinger liquids. One of their key properties is spin–charge separation: instead of quasiparticles, collective excitations of charge (with no spin) and spin (with no charge) are formed, which move independently and at different velocities. However, experimental confirmation of spin–charge separation remains a challenge. Here we report experiments probing the charge and heat current in quasi-one-dimensional conductors—the organic Bechgaard salts. It was found that the charge and spin excitations have distinctly different thermal conductivities, which gives strong evidence for spin–charge separation. The spin excitations have a much larger thermal conductivity than the charge excitations, which indicates that the coupling of the charge excitations to the lattice is important.

Bandwidth-controlled Mott transition in κ − ( BEDT − TTF ) 2 Cu [ N ( C N ) 2 ] Br x Cl 1 − x : Optical studies of localized charge excitations

Infrared reflection measurements of the half-filled two-dimensional organic conductors

Bandwidth-controlled Mott transition in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]BrxCl1-x: Optical studies of correlated carriers.

\kappa

Comprehensive transport study of anisotropy and ordering phenomena in quasi-one-dimensional(TMTTF)2Xsalts (X=PF6,AsF6,SbF6,BF4,ClO4,ReO4)

-(BEDT-TTF)

Charge and spin dynamics of TMTSF and TMTTF salts

_2

Charge Order Breaks Magnetic Symmetry in Molecular Quantum Spin Chains

Cu[N(CN)

Charge-transfer processes in radical ion molecular conductors κ-(BEDT-TTF)2Cu[N(CN)2]BrxCl1 − x: The superconductor (x = 0.9) and the conductor with the metal-insulator transition (x = 0)

_{2}

Coherent particle response of two-dimensional organic conductors upon crossing the Mott transition

]Br

Retraction: Evidence for spin-charge separation in quasi-one-dimensional organic conductors.

_{x}

Mid-infrared response of charge-ordered quasi-1D organic conductors (TMTTF)2X

Cl