Unconventional superconductivity with a radial-node gap in quasi-one-dimensional metals
Unconventional superconductivity with a radial-node gap in quasi-one-dimensional metals
复制标题
准一维金属中具有径向节点间隙的非常规超导性
DOI：
10.1088/0953-8984/14/39/103
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
K. Miyake
中科院分区：
文献类型：
--
作者：
Y. Fuseya;Y. Onishi;H. Kohno;K. Miyake
结果表明，一种新的类型的超导性是可能的一维（1D）和准一维（Q1 D）的金属，其中的配对相互作用是由自旋和电荷波动介导的。差距函数在费米面附近的径向方向上不可避免地改变符号;对于1D，它在费米点处消失，而对于Q1 D，它在费米面上具有线节点，就像在通常的各向异性配对中一样。转变温度Tc一般是较高的单线态配对比三重态，但只有几倍。这意味着在中等大的塞曼磁场下，三重态配对的Tc可以超过单重态配对的Tc，即，场诱导三重配对这个特征似乎可以解释HC 2的异常行为和在（TMTSF）2 PF 6中观察到的奈特位移。
It is shown that a new type of superconductivity is possible in one-dimensional (1D) and quasi-one-dimensional (Q1D) metals where the pairing interaction is mediated by both spin and charge fluctuations. The gap function inevitably changes sign in the radial direction near the Fermi surface; it vanishes at the Fermi points for 1D, and for Q1D it has line nodes on the Fermi surface as in usual anisotropic pairings. The transition temperature Tc is generally higher for the singlet pairing than for the triplet, but only by a few times. This implies that Tc for the triplet pairing can exceed that of the singlet under a moderately large Zeeman magnetic field, i.e., field-induced triplet pairing. This feature seems to explain the anomalous behaviours of Hc2 and the Knight shift observed in (TMTSF)2PF6.