Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe
Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe
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DOI：
10.1103/physrevb.87.180505
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发表时间：
2013-05-23
影响因子：
3.7
通讯作者：
Meingast, C.
中科院分区：
文献类型：
--
作者：
Boehmer, A. E.;Hardy, F.;Meingast, C.
使用高分辨率热膨胀测量研究了气相生长 FeSe 单晶中的超导性和正交变形之间的耦合。与Ba122基（Ba122）超导体相比，我们发现超导性不会将正交性降低到T-c以下。相反，我们发现超导性与面内区域强烈耦合，这解释了巨大的静水压力效应。我们根据自旋向列场景讨论了我们的结果，并认为 FeSe 具有许多与典型的铁基超导体截然不同的特征。
The coupling between superconductivity and orthorhombic distortion is studied in vapor-grown FeSe single crystals using high-resolution thermal-expansion measurements. In contrast to the Ba122-based (Ba122) superconductors, we find that superconductivity does not reduce the orthorhombicity below T-c. Instead we find that superconductivity couples strongly to the in-plane area, which explains the large hydrostatic pressure effects. We discuss our results in light of the spin-nematic scenario and argue that FeSe has many features that are quite different from typical Fe-based superconductors.