ANOMALOUS ELASTIC BEHAVIOR AND ITS CORRELATION WITH SUPERCONDUCTIVITY IN IRON-BASED SUPERCONDUCTOR Ba(Fe1-xCox)2As2
ANOMALOUS ELASTIC BEHAVIOR AND ITS CORRELATION WITH SUPERCONDUCTIVITY IN IRON-BASED SUPERCONDUCTOR Ba(Fe1-xCox)2As2
复制标题
铁基超导体Ba(Fe1-xCox)2As2的反常弹性行为及其与超导性的关系
DOI：
10.1142/s0217984912300116
复制
发表时间：
2012
影响因子：
1.9
通讯作者：
Shalamujiang Simayi
中科院分区：
文献类型：
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作者：
M. Yoshizawa;Shalamujiang Simayi
综述了铁基超导体Ba（Fe_（1-x）Co_x）_2As_2在不同Co含量x下的弹性性质。在所有的弹性常数中，C66表现出显著的软化，这与从四方晶系到斜方晶系的结构转变有关。对于x < 0.07的欠掺杂样品，C66的异常量为90%，对于过掺杂样品，随着Co浓度的增加，C66的异常逐渐消失。弹性柔量S66（= 1/C66）表现出量子临界行为，其表现就像非常规超导体的磁化率。超导转变温度与S66中的异常量之间存在明显的相关性。结果表明，S66测量的结构涨落在超导电性的出现中起着重要的作用。Ba（Fe_（1-x）Co_x）_2As_2的弹性反常具有强的电子-晶格耦合，这可能源于铁的3d轨道。这不仅是铁基超导体中的普遍现象，也是d电子基超导体中的普遍现象。Ba（Fe_（1-x）Co_x）_2As_2的研究结果揭示了由于轨道引起的结构涨落的相关作用，这对于全面理解铁基超导体及相关材料的超导电性具有重要意义。
Elastic properties of iron-based superconductor Ba(Fe1-xCox)2As2 with various Co concentrations x were reviewed. Among all elastic constants, C66 shows remarkable softening associated with the structural transition from tetragonal to orthorhombic. The amount of anomaly in C66 is 90% for the underdoped samples of x < 0.07 For the overdoped samples, the anomalies in C66 gradually disappear with the increasing of Co concentration. The elastic compliance S66 (= 1/C66) shows a quantum critical behavior, which behaves just like the magnetic susceptibility of unconventional superconductors. There exists a clear correlation between the superconducting transition temperature and the amount of anomaly in S66. It was suggested that the structural fluctuation, which is measured by S66, plays an important role in the emergence of superconductivity. The elastic anomaly of Ba(Fe1-xCox)2As2 is characterized by a strong electron–lattice coupling, which would be originated from the 3d orbitals of iron. This might be a universal phenomenon not only in iron-based superconductors but also d-electron based superconductors. The results on Ba(Fe1-xCox)2As2 would reveal relevant roles of the structural fluctuations due to the orbitals, which should be taken into account for the understanding of a whole picture of the superconductivity in iron-based superconductors and related materials.
影响因子：
8.6
作者：
Fletcher, J. D.;Serafin, A.;Carrington, A.
通讯作者：
Carrington, A.