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arXiv 0906.2285cond-mat.str-el
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准一维有机导体单重态到三重态超导电性交叉的机制

Mechanism for the Singlet to Triplet Superconductivity Crossover in Quasi-One-Dimensional Organic Conductors

Kazuto Kajiwara, Masahisa Tsuchiizu, Yoshikazu Suzumura, Claude Bourbonnais

摘要:

本文用双圈重整化群方法研究了具有四分之一填充带的准一维有机导体的超导电性,其中包括单电子跳跃t_{\perp}和垂直于链的排斥相互作用V_{\perp}.对于偏离完美嵌套的四片费米面,我们计算了主导涨落和可能的超导态的响应函数。通过增加V_{\perp},它表明,d-波(单线态)到f-波(三线态)超导态的交叉发生,并随之消失的自旋间隙。此外,我们研究了磁场通过塞曼耦合的影响,从三重态超导态的出现。

英文摘要:

Superconductivity of quasi-one-dimensional organic conductors with a quarter-filled band is investigated using the two-loop renormalization group approach to the extended Hubbard model for which both the single electron hopping t_{\perp} and the repulsive interaction V_{\perp} perpendicular to the chains are included. For a four-patches Fermi surface with deviations to perfect nesting, we calculate the response functions for the dominant fluctuations and possible superconducting states. By increasing V_{\perp}, it is shown that a d-wave (singlet) to f-wave (triplet) superconducting state crossover occurs, and is followed by a vanishing spin gap. Furthermore, we study the influence of a magnetic field through the Zeeman coupling, from which a triplet superconducting state is found to emerge.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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