Theory of triangular lattice quasi-one-dimensional charge-transfer solids

Theory of triangular lattice quasi-one-dimensional charge-transfer solids
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三角晶格准一维电荷转移固体理论

DOI:
10.1103/physrevb.100.115158
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发表时间:
2019
期刊:
影响因子:
3.7
通讯作者:
Mazumdar, S.
Mazumdar, S.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Clay, R. T.;Gomes, N.;Mazumdar, S.

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最近对准一维三角晶格有机电荷转移固体磁性的研究和超导电性的发现表明,有效填充带Hubbard模型对这些和相关系统的严重局限性。我们目前的计算研究内的填充带哈伯德模型,这些高度各向异性系统。在我们的理论中,单个的有机单体分子,而不是它们的二聚体,构成了哈密顿量的位置。我们发现,超导配对关联的长程分量的增强由Hubbard排斥相互作用对应的带参数,这是在中等压力下的超导。我们发现显着较弱的超导配对在现实的值ofin,我们归因于实验观察到的过渡到一个自旋能隙绝缘体形成的成对电子晶体。我们作出了可检验的预言:自旋能隙将伴随着电荷有序化和周期加倍。较弱的倾向超导相比,是符合更多的一维字符的前者。然而,压力诱导的超导性是可以想象的。这些结果支持了我们最近提出的超导电性的价键理论。
Recent investigations of the magnetic properties and the discovery of superconductivity in quasi-one-dimensional triangular lattice organic charge-transfer solids have indicated the severe limitations of the effective-filled band Hubbard model for these and related systems. We present computational studies within the-filled band Hubbard model for these highly anisotropic systems. Individual organic monomer molecules, and not their dimers, constitute the sites of the Hamiltonian within our theory. We find enhancement of the long-range component of superconducting pairing correlations by the Hubbard repulsive interactionfor band parameters corresponding to, which is superconducting under moderate pressure. We find significantly weaker superconducting pairing at realistic values ofin, and we ascribe the experimentally observed transition to a spin-gapped insulator to the formation of a paired-electron crystal. We make the testable prediction that the spin gap will be accompanied by charge ordering and period doubling in two lattice directions. The weaker tendency to superconductivity incompared tois consistent with the more one-dimensional character of the former. Pressure-induced superconductivity is, however, conceivable. The overall results support a valence bond theory of superconductivity we have proposed recently.
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