Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-11-24
Phys. Status Solidi B 249, 991 (2012)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, proceedings of ISCOM 2011
Scientific paper
The occurrence of antiferromagnetism in kappa-(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 antiferromagnetism, 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 state coexisting 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 kappa-(ET)_2Cu_2(CN)_3 and beta'-EtMe_3Sb[Pd(dmit)_2]_2 which we believe are PECs at low temperatures.
Clay Torsten R.
Dayal Saurabh
Li Handong
Mazumdar Subham
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