Tuesday, May 7, 2013

1305.0843 (N. Gomes et al.)

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

N. Gomes, R. T. Clay, S. Mazumdar
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.
View original: http://arxiv.org/abs/1305.0843

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