English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We review the interplay of frustration and strong electronic correlations inquasi-two-dimensional organic charge transfer salts, such as k-(BEDT-TTF)_2Xand Et_nMe_{4-n}Pn[Pd(dmit)2]2. These two forces drive a range of exotic phasesincluding spin liquids, valence bond crystals, pseudogapped metals, andunconventional superconductivity. Of particular interest is that in severalmaterials there is a direct transition as a function of pressure from a spinliquid Mott insulating state to a superconducting state. Experiments on thesematerials raise a number of profound questions about the quantum behaviour offrustrated systems, particularly the intimate connection between spin liquidsand superconductivity. Insights into these questions have come from a widerange of theoretical techniques including first principles electronicstructure, quantum many-body theory and quantum field theory. In this review weintroduce the basic ideas of the field by discussing a simple frustratedHeisenberg model with four spins. We then describe the key experimentalresults, emphasizing that for two materials, k-(BEDT-TTF)_2Cu_2(CN)_3 andEtMe_3Sb[Pd(dmit)_2]_2, there is strong evidence for a spin liquid groundstate, and for EtMe_3P[Pd(dmit)_2]_2, a valence bond solid ground state. Wereview theoretical attempts to explain these phenomena, arguing that this canbe captured by a Hubbard model on the anisotropic triangular lattice at halffilling, and that resonating valence bond wavefunctions can capture most of theessential physics. We review evidence that this model can have a spin liquidground state for a range of parameters that are realistic for the relevantmaterials. We conclude by summarising the progress made thus far andidentifying some of the key questions still to be answered.

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