在最佳掺杂的铁基超导体中普遍存在的向列量子临界点特征。
Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors.
机构信息
Stanford Institute of Energy and Materials Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park 94025, CA 94305, USA. Department of Material Science and Engineering and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA.
Stanford Institute of Energy and Materials Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park 94025, CA 94305, USA. Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA.
出版信息
Science. 2016 May 20;352(6288):958-62. doi: 10.1126/science.aab0103.
A key actor in the conventional theory of superconductivity is the induced interaction between electrons mediated by the exchange of virtual collective fluctuations (phonons in the case of conventional s-wave superconductors). Other collective modes that can play the same role, especially spin fluctuations, have been widely discussed in the context of high-temperature and heavy Fermion superconductors. The strength of such collective fluctuations is measured by the associated susceptibility. Here we use differential elastoresistance measurements from five optimally doped iron-based superconductors to show that divergent nematic susceptibility appears to be a generic feature in the optimal doping regime of these materials. This observation motivates consideration of the effects of nematic fluctuations on the superconducting pairing interaction in this family of compounds and possibly beyond.
在传统超导理论中，一个关键角色是电子之间通过虚拟集体涨落（对于传统 s 波超导体来说是声子）交换介导的诱导相互作用。在高温和重费米子超导体的背景下，人们广泛讨论了其他可以发挥相同作用的集体模式，特别是自旋涨落。这种集体涨落的强度可以通过相关的磁化率来衡量。在这里，我们使用来自五个最佳掺杂铁基超导体的差弹性电阻测量结果表明，发散的向列磁化率似乎是这些材料在最佳掺杂区域的一个普遍特征。这一观察结果促使人们考虑向列涨落在这些化合物家族以及可能超出这些化合物家族的超导配对相互作用中的影响。
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