Unconventional superconductivity with a sign reversal in the order parameter of LaFeAsO1-xFx
Unconventional superconductivity with a sign reversal in the order parameter of LaFeAsO1-xFx
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DOI：
10.1103/physrevlett.101.057003
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发表时间：
2008-08-01
影响因子：
8.6
通讯作者：
Du, M. H.
中科院分区：
文献类型：
--
作者：
Mazin, I. I.;Singh, D. J.;Du, M. H.
我们认为，新发现的超导电性在近磁性，铁基层状化合物是非常规的，介导的反铁磁自旋波动，虽然不同于通常的超交换和特定的这种化合物。这种状态是扩展的s波配对的一个例子，不同的费米表面片之间的顺序参数的符号反转。在这种情况下，掺杂的主要作用是降低态密度和抑制对破缺的铁磁涨落。
We argue that the newly discovered superconductivity in a nearly magnetic, Fe-based layered compound is unconventional and mediated by antiferromagnetic spin fluctuations, though different from the usual superexchange and specific to this compound. This resulting state is an example of extended s-wave pairing with a sign reversal of the order parameter between different Fermi surface sheets. The main role of doping in this scenario is to lower the density of states and suppress the pair-breaking ferromagnetic fluctuations.