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

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 correc...

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Published in:Physica Status Solidi. B: Basic Solid State Physics 2012-05, Vol.249 (5), p.991-994
Main Authors: Clay, R. T., Dayal, S., Li, H., Mazumdar, S.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Atomic force microscopy
Charge
Dimers
lattice frustration
Lattices
Mathematical models
organic superconductors
Solid state physics
Spin liquid
spin liquids
strong correlations
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description 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.
doi_str_mv 10.1002/pssb.201100727
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subjects Antiferromagnetism
Atomic force microscopy
Charge
Dimers
lattice frustration
Lattices
Mathematical models
organic superconductors
Solid state physics
Spin liquid
spin liquids
strong correlations
title Beyond the quantum spin liquid concept in frustrated two dimensional organic superconductors
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