Abstract
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 language | English (US) |
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Pages (from-to) | 991-994 |
Number of pages | 4 |
Journal | Physica Status Solidi (B) Basic Research |
Volume | 249 |
Issue number | 5 |
DOIs | |
State | Published - May 2012 |
Keywords
- Lattice frustration
- Organic superconductors
- Spin liquids
- Strong correlations
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics