Scaling between Magnetic and Lattice Fluctuations in Iron Pnictide Superconductors
Scaling between Magnetic and Lattice Fluctuations in Iron Pnictide Superconductors
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DOI：
10.1103/physrevlett.111.137001
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发表时间：
2013-09-24
影响因子：
8.6
通讯作者：
Schmalian, Joerg
中科院分区：
文献类型：
--
作者：
Fernandes, Rafael M.;Boehmer, Anna E.;Schmalian, Joerg
砷化铁的相图以磁相变和结构相变为主，需要抑制磁相变和结构相变才能出现超导性。两条转变温度线之间的接近表明这两个相之间的相关性，其性质尚未确定。在这里，我们发现了电子掺杂Ba(Fe1-xCox)(2)As-2化合物的四方相核磁共振和剪切模量数据之间的标度关系。由于前者探测磁波动的强度，而后者对正交波动敏感，我们的结果为磁驱动的结构转变提供了强有力的证据。
The phase diagram of the iron arsenides is dominated by a magnetic and a structural phase transition, which need to be suppressed in order for superconductivity to appear. The proximity between the two transition temperature lines indicates correlation between these two phases, whose nature remains unsettled. Here, we find a scaling relation between nuclear magnetic resonance and shear modulus data in the tetragonal phase of electron-doped Ba(Fe1-xCox)(2)As-2 compounds. Because the former probes the strength of magnetic fluctuations while the latter is sensitive to orthorhombic fluctuations, our results provide strong evidence for a magnetically driven structural transition.