Functional renormalization-group study of the pairing symmetry and pairing mechanism of the FeAs-based high-temperature superconductor.
Functional renormalization-group study of the pairing symmetry and pairing mechanism of the FeAs-based high-temperature superconductor.
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DOI：
10.1103/physrevlett.102.047005
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发表时间：
2008-05
影响因子：
8.6
通讯作者：
Fa Wang;H. Zhai;Ying Ran;A. Vishwanath;Dung-Hai Lee
中科院分区：
文献类型：
--
作者：
Fa Wang;H. Zhai;Ying Ran;A. Vishwanath;Dung-Hai Lee
我们应用费米子泛函重整化群方法确定了FeAs基材料的配对对称性和配对机制。在具有纯排斥作用的五带模型中，我们发现了电子驱动的超导对不稳定性。对于我们所研究的掺杂和相互作用参数，扩展s波总是最有利的配对对称性，其序参数在电子和空穴袋上呈现相反的符号。配对机制是由反铁磁关联产生的费米面间约瑟夫森散射。
We apply the fermion functional renormalization-group method to determine the pairing symmetry and pairing mechanism of the FeAs-Based materials. Within a five band model with pure repulsive interactions, we find an electronic-driven superconducting pairing instability. For the doping and interaction parameters we have examined, extended s wave, whose order parameter takes on opposite sign on the electron and hole pockets, is always the most favorable pairing symmetry. The pairing mechanism is the inter-Fermi-surface Josephson scattering generated by the antiferromagnetic correlation.