Superconductivity and density wave in the quasi-one-dimensional systems: Renormalization group study
Superconductivity and density wave in the quasi-one-dimensional systems: Renormalization group study
复制标题
DOI：
10.1143/jpsj.74.1263
复制
发表时间：
2005-04-01
影响因子：
1.7
通讯作者：
Suzumura, Y
中科院分区：
文献类型：
--
作者：
Fuseya, Y;Suzumura, Y
准一维 (q1d) 系统中的各向异性超导性和密度波已针对具有后向 (g(1)) 和前向 (g(2)) 散射相互作用的模型进行了研究。通过使用Kadanoff-Wilson重正化群方法中的单环近似，发现响应函数对温度（T）的依赖性与exp（1/T）成正比。 q1d系统的相图是在g(2)-g(1)平面上得到的，与纯一维相图相比，在超导状态下出现了明显的变化。由次近邻相互作用 (V-2) 引起的大电荷波动抑制了 d(x2-y2) 波单线态超导 (dSS) 态，但增强了 f 波三线态超导 (fTS) 态。由于 fTS 的转变温度与 AS 的转变温度相当，因此大 V-2 可能会出现场诱导的 f 波三重态配对。讨论这些特征是为了理解 (TMTSF)(2)PF6 盐的实验。
The anisotropic superconductivity and the density wave in the quasi-one-dimensional (q1d) system have been studied for a model with interactions of both the backward (g(1)) and the forward (g(2)) scatterings. By using the one-loop approximation in the Kadanoff-Wilson renormalization group method, it is found that the dependence of response functions on the temperature (T) is proportional to exp(1/T). The phase diagram for the q1d system is obtained on the g(2)-g(1) plane, where the noticeable change compared with the purely one-dimensional one appears in the superconducting state. The large charge fluctuation, which is induced by next-nearest neighbor interactions (V-2), suppresses the d(x2-y2) wave singlet superconducting (dSS) state but enhances the f-wave triplet superconducting (fTS) state. The field-induced f-wave triplet pairing could be expected for large V-2 since the transition temperature of fTS becomes comparable to that of AS. These features are discussed to comprehend the experiments on the (TMTSF)(2)PF6 salt.