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首页> 外文期刊>Physical review >Absence of nematic order in the pressure-induced intermediate phase of the iron-based superconductor Ba_(0.85)K_(0.15)Fe_2As_2
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Absence of nematic order in the pressure-induced intermediate phase of the iron-based superconductor Ba_(0.85)K_(0.15)Fe_2As_2

机译：铁基超导体Ba_（0.85）K_（0.15）Fe_2As_2的压力诱导中间相中无向列序

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摘要

The hole doped Fe-based superconductors Ba_(1-x)A_xFe_2As_2 (where A = Na or K) show a particularly rich phase diagram. It was observed that an intermediate reentrant tetragonal phase, in which the C_4 fourfold rotational symmetry is restored, forms within the orthorhombic antiferromagnetically ordered stripe-type spin density wave state above the superconducting transition [S. Avci et al., Nat. Commun. 5, 3845 (2014); A. E. Bohmer et al., Nat. Commun. 6, 7911 (2015)]. A similar intermediate phase was reported to appear if pressure is applied to underdoped Ba_(1-x)K_xFe_2As_2 [E. Hassinger et al., Phys. Rev. B 86,140502(R) (2012)]. Here we report data of the electric resistivity, Hall effect, specific heat, and the thermoelectric Nernst and Seebeck coefficients measured on a Ba_(0.85)K_(0.15)Fe_2As_2 single crystal under pressure up to 5.5 GPa. The data reveal a coexistence of the intermediate phase with filamentary superconductivity. The Nernst coefficient shows a large signature of nematic order that coincides with the stripe-type spin density wave state up to optimal pressure. In the pressure-induced intermediate phase the nematic order is removed, thus confirming that its nature is a reentrant tetragonal phase.
机译：空穴掺杂的铁基超导体Ba_（1-x）A_xFe_2As_2（其中A = Na或K）显示出特别丰富的相图。观察到在超导转变上方的正交各向异性反铁磁有序条带型自旋密度波状态内形成了中间折返四方相，其中C_4四重旋转对称得以恢复。 Avci等人，美国国家科学院。公社5，3845（2014）; A.E.Bohmer等人，Nat。公社6，7911（2015）]。据报道，如果对欠掺杂的Ba_（1-x）K_xFe_2As_2施加压力，就会出现类似的中间相[E.哈辛格（Hassinger）等人，物理学。修订版B 86,140502（R）（2012）。在这里，我们报告了在最高压力为5.5 GPa的Ba_（0.85）K_（0.15）Fe_2As_2单晶上测得的电阻率，霍尔效应，比热以及热电能斯特和塞贝克系数的数据。数据显示中间相与丝状超导性共存。能斯特系数显示出向列数阶的大特征，其与直至最佳压力的条纹型自旋密度波状态一致。在压力诱导的中间相中，向列相被除去，因此证实其性质是可重入的四方相。

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  • 来源
    《Physical review》 |2016年第10期|104516.1-104516.7|共7页
  • 作者

    Yan Zheng; Pok Man Tam; Jianqiang Hou; Anna E. Bohmer; Thomas Wolf; Christoph Meingast; Rolf Lortz;

  • 作者单位

    Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;

    Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;

    Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;

    Institute for Solid State Physics, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany ,Fakultdt fuer Physik, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany;

    Institute for Solid State Physics, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany;

    Institute for Solid State Physics, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany;

    Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;

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