Beyond the quantum spin liquid concept in frustrated two dimensional organic superconductors

R. T. Clay, S. Dayal, H. Li, S. Mazumdar

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The occurrence of antiferromagnetism (AFM) in κ-(ET)2X can be understood within an effective 1/2-filled band with dimers of ET molecules containing one hole each. We argue that while this effective model can describe the presence of AFM, a complete description for these materials requires the correct carrier density of one-half per molecule. For dimerized and strongly frustrated 1/4-filled lattices we show that a singlet-paired statecoexisting with charge ordering occurs that we have termed the paired electron crystal (PEC). Here we investigate the 1/4-filled model on a dimerized lattice, showing regions where AFM, PEC, and the Wigner-crystal occur. We point out the need to go beyond quantum spin liquid concepts for highly frustrated materials such as κ-(ET)2Cu2(CN)3 and β′-EtMe3Sb[Pd(dmit)2]2 which we believe are PECs at low temperatures.

Original languageEnglish (US)
Pages (from-to)991-994
Number of pages4
JournalPhysica Status Solidi (B) Basic Research
Issue number5
StatePublished - May 2012


  • Lattice frustration
  • Organic superconductors
  • Spin liquids
  • Strong correlations

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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