Multifunctional interplay among the conductivity, magnetism and dielectricity in π–d interacting λ-(BETS)2FeCl4

Toyota, Naoki; Suzuki, Takahiro

doi:10.1016/j.crci.2006.09.010

Cited by 5 publications

(1 citation statement)

References 95 publications

(105 reference statements)

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“…The simplest possible lattice model Hamiltonian to describe this family of materials is a Hubbard-Kondo model with a Hubbard model on an anisotropic triangular lattice at half filling with an exchange interaction between the electrons and localized spin-5/2 spins (Cépas et al 2002). However, there are questions about the role of dielectric fluctuations and charge ordering in these materials (Toyota and Suzuki 2007). The fact that one can tune between ground states with perturbations involving energy scales of the order of 1 meV (e.g.…”

Section: λ-(Bets) 2 Xmentioning

confidence: 99%

Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors

2011

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We review the interplay of frustration and strong electronic correlations in quasi-two-dimensional organic charge transfer salts, such as (BEDT-TTF) 2 X and EtnMe 4−n P n[Pd(dmit) 2 ] 2 . These two forces drive a range of exotic phases including spin liquids, valence bond crystals, pseudogapped metals, and unconventional superconductivity. Of particular interest is that in several materials with increasing pressure there is a first-order transition from a spin liquid Mott insulating state to a superconducting state. Experiments on these materials raise a number of profound questions about the quantum behaviour of frustrated systems, particularly the intimate connection between spin liquids and superconductivity. Insights into these questions have come from a wide range of theoretical techniques including first principles electronic structure, quantum many-body theory and quantum field theory. In this review we introduce some of the basic ideas of the field by discussing a simple frustrated Heisenberg model with four spins. We then describe the key experimental results, emphasizing that for two materials, κ-(BEDT-TTF) 2 Cu 2 -(CN) 3 and EtMe 3 Sb[Pd(dmit) 2 ] 2 , there is strong evidence for a spin liquid ground state, and for another, EtMe 3 P[Pd(dmit) 2 ] 2 , there is evidence of a valence bond crystal ground state. We review theoretical attempts to explain these phenomena, arguing that they can be captured by a Hubbard model on the anisotropic triangular lattice at half filling, and that Resonating Valence Bond (RVB) wavefunctions capture most of the essential physics. We review evidence that this Hubbard model can have a spin liquid ground state for a range of parameters that are realistic for the relevant materials. In particular, spatial anisotropy and ring exchange are key to destabilising magnetic order. We conclude by summarising the progress made thus far and identifying some of the key questions still to be answered. (S,S13,S24)= J J' J J J 1 2 3 4

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Section: λ-(Bets) 2 Xmentioning

confidence: 99%

Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors

2011

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Crystal Structure and Magnetic Characteristics of a New 3‐Methylisoquinolinium Tetrachloridoferrate(III)

Wyrzykowski

Sikorski

Kłak

et al. 2009

Zeitschrift anorg allge chemie

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The crystal structure of a new 3‐methylisoquinolinium[3‐Me(IsoQH)] salt, [3‐Me(IsoQH)][FeCl4], was determined. The iron cation is tetracoordinated by chlorine anions, and it adopts a slightly distorted tetrahedral coordination. In the crystal structure, there are π···π stacking interactions between the 3‐methylisoquinolinium cations in an ABAB infinite arrangement, N–H···Cl hydrogen bonds, and C–H···Cl intermolecular interactions. Magnetic measurements of a powdered sample were carried out. A negative Weiss constant as well as the intermolecular exchange parameter for [3‐Me(IsoQH)][FeCl4] indicate the occurrence of antiferromagnetic interactions transmitted in the crystal lattice.

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Structural and magnetic characteristics of tetramethylammonium tetrahalogenoferrates(III)

Wyrzykowski

́ski

Kłak

et al. 2008

Inorganica Chimica Acta

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Multifunctional interplay among the conductivity, magnetism and dielectricity in π–d interacting λ-(BETS)2FeCl4

Cited by 5 publications

References 95 publications

Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors

Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors

Crystal Structure and Magnetic Characteristics of a New 3‐Methylisoquinolinium Tetrachloridoferrate(III)

Structural and magnetic characteristics of tetramethylammonium tetrahalogenoferrates(III)

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