Nematic superconducting state in iron pnictide superconductors.
Nematic superconducting state in iron pnictide superconductors.
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铁磷族化物超导体中的向列超导态
DOI：
10.1038/s41467-017-02016-y
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发表时间：
2017-12-01
影响因子：
16.6
通讯作者：
Moshchalkov VV
中科院分区：
文献类型：
--
作者：
Li J;Pereira PJ;Yuan J;Lv YY;Jiang MP;Lu D;Lin ZQ;Liu YJ;Wang JF;Li L;Ke X;Van Tendeloo G;Li MY;Feng HL;Hatano T;Wang HB;Wu PH;Yamaura K;Takayama-Muromachi E;Vanacken J;Chibotaru LF;Moshchalkov VV
向列有序常常打破铁基超导体的四轴对称性。它产生于正常相的规则结构转变或电子不稳定性。在这里，我们报告的一个超导态的观察，通过测量的角度依赖性的面内和面外的Ba0.5K0.5Fe2As2单晶的磁阻。当外加磁场的方向在基面内旋转时，我们发现在超导转变附近存在大的二重振荡。为了避免样品几何形状或电流方向的影响，样品被设计为用于面内测量的Corbino形状和用于面外测量的台面形状。理论分析表明，超导体的超导性来自于超导凝聚体的准简并s波和d波分量的弱混合，最有可能是由单晶固有的应力的弱各向异性引起的。向列电子序是罕见的，它的出现往往表明相变。在这里，Li等人通过测量面内和面外磁电阻率的角度依赖性，报道了Ba 0.5K 0.5Fe 2As 2的超导态。
Nematic order often breaks the tetragonal symmetry of iron-based superconductors. It arises from regular structural transition or electronic instability in the normal phase. Here, we report the observation of a nematic superconducting state, by measuring the angular dependence of the in-plane and out-of-plane magnetoresistivity of Ba0.5K0.5Fe2As2 single crystals. We find large twofold oscillations in the vicinity of the superconducting transition, when the direction of applied magnetic field is rotated within the basal plane. To avoid the influences from sample geometry or current flow direction, the sample was designed as Corbino-shape for in-plane and mesa-shape for out-of-plane measurements. Theoretical analysis shows that the nematic superconductivity arises from the weak mixture of the quasi-degenerate s-wave and d-wave components of the superconducting condensate, most probably induced by a weak anisotropy of stresses inherent to single crystals. Nematic electronic order is rare and its onset often indicates a phase transition. Here, Li et al. report a nematic superconducting state in Ba0.5K0.5Fe2As2 by measuring the angular dependence of the in-plane and out-of-plane magnetoresistivity.
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影响因子：
13.6
作者：
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通讯作者：
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作者：
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通讯作者：
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作者：
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通讯作者：
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通讯作者：
Bishop, DJ