Gomes N, Clay RT, Mazumdar S. Absence of superconductivity and valence bond order in the Hubbard-Heisenberg model for organic charge-transfer solids.
J Phys Condens Matter 2013;
25:385603. [PMID:
23995074 DOI:
10.1088/0953-8984/25/38/385603]
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Abstract
A frustrated, effective ½-filled band Hubbard-Heisenberg model has been proposed for describing the strongly dimerized charge-transfer solid families κ-(ET)2X and Z[Pd(dmit)2]2. In addition to showing unconventional superconductivity, these materials also exhibit antiferromagnetism, candidate spin-liquid phases, and, in the case of Z=EtMe3P, a spin-gapped phase that has sometimes been referred to as a valence bond solid. We show that neither superconductivity nor the valence bond order phase occurs within the Hubbard-Heisenberg model. We suggest that a description based on ¼-filling, that is reached when the carrier concentration per molecule instead of per dimer is considered, thus may be appropriate.
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