Effect of band structure on the symmetry of superconducting states
Effect of band structure on the symmetry of superconducting states
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DOI：
10.1143/jpsj.70.2698
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发表时间：
2001-02
影响因子：
1.7
通讯作者：
K. Kuboki
中科院分区：
文献类型：
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作者：
K. Kuboki
研究了带结构对超导态对称性的影响。我们证明了当费米表面的形状改变时，在同一类型的相互作用中，SC态的各种对称性是可能的。作为一个简单的模型，我们考虑了一个具有最近邻吸引相互作用的方晶格系统，并发现自旋三重态（（p x + ip y）波）和自旋单重态（d -或s -波）SC态，以及它们共存的态（d + ip y, s + ip y）可以在电子密度（从而改变费米表面）的情况下稳定下来。在考虑层间吸引相互作用的情况下，研究了带线节点的层间配对态的稳定性，并讨论了其与sr2ruo4的SC态的关系。
Effects of band structure on the symmetry of superconducting (SC) states are studied. We show that various symmetries of SC states are possible within the same type of interaction when the shape of the Fermi surface is changed. As a simple model we consider a square lattice system with a nearest-neighbor attractive interaction, and find that the spin-triplet (( p x + i p y )-wave) and spin-singlet ( d - or s -wave) SC states, and states with their coexistence ( d + i p y , s + i p y ) can be stabilized if the electron density (and thus the Fermi surface) is changed. By taking into account the interlayer attractive interaction in this model, the stability of interlayer-pairing states with line nodes is examined, and its relation to the SC state of Sr 2 RuO 4 is discussed.