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Organic superconductors: the need to go beyond effective 1/2-filled band models

A frustrated, effective 1/2-filled band Hubbard-Heisenberg model has been proposed to describe the strongly dimerized charge-transfer solid families kappa-(ET)_2X and Z[Pd(dmit)_2]_2. In addition to unconventional superconductivity these materials also exhibit antiferromagnetism, candidate spin-liquid phases, and in the case of Z=EtMe_3P, a so-called valence-bond solid phase. We show that neither superconductivity nor the valence-bond solid phase occurs within the Hubbard-Heisenberg model, indicating that the effective 1/2-filled band model is unsuitable for these materials.

preprint2013arXivOpen access
N. GomesR. T. ClayS. Mazumdar
cond-mat.supr-concond-mat.str-el
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N. GomesR. T. ClayS. Mazumdar

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