Iron-based layered compound LaFeAsO is an antiferromagnetic semimetal
Iron-based layered compound LaFeAsO is an antiferromagnetic semimetal
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DOI：
10.1103/physrevb.78.033111
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发表时间：
2008-07-01
影响因子：
3.7
通讯作者：
Lu, Zhong-Yi
中科院分区：
文献类型：
--
作者：
Ma, Fengjie;Lu, Zhong-Yi
LaFeAsO 是铁基掺氟超导体的母体化合物。了解其基相和电子结构是了解潜在超导机制的先决条件。我们的研究表明，LaFeAsO 是一种准二维反铁磁半金属，大多数载流子是电子，磁矩为 2.3 mu(B)，位于 Fe-Fe 方晶格上每个 Fe 原子周围。从物理上讲，这是由于费米表面嵌套而产生的相应反铁磁自旋密度波。 F掺杂后观察到的超导发生在Fe-Fe层上，这表明了一种由自旋涨落介导的新超导机制。
LaFeAsO is a parent compound of iron-based F-doped superconductors. An understanding of its ground phase and electronic structure is a precondition to understanding the underlying superconductivity mechanism. Our study shows that LaFeAsO is a quasi-two-dimensional antiferromagnetic semimetal with most carriers being electrons and with a magnetic moment of 2.3 mu(B) located around each Fe atom on the Fe-Fe square lattice. Physically, this is a commensurate antiferromagnetic spin-density wave due to the Fermi-surface nesting. The observed superconduction after the F doping happens on the Fe-Fe layer suggesting a new superconductivity mechanism mediated by spin fluctuations.