科研之友
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摘要
A frustrated, effective 1/2-filled band Hubbard-Heisenberg model has been proposed for describing the strongly dimerized charge-transfer solid families kappa-(ET)(2)X 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 D 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 1/4-filling, that is reached when the carrier concentration per molecule instead of per dimer is considered, thus may be appropriate.
- 出版日期2013-9-25
