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首页> 外文期刊>Physica, B. Condensed Matter >Anisotropic superconductivity in beta-(BDA-TTP)(2)SbF6: STM spectroscopy
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Anisotropic superconductivity in beta-(BDA-TTP)(2)SbF6: STM spectroscopy

机译：β-（BDA-TTP）（2）SbF6中的各向异性超导：STM光谱

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摘要

We have investigated the gap symmetry in the superconducting phase of beta-(BDA-TTP)(2)SbF6 with use of the scanning tunneling microscope (STM). The tunneling spectra obtained on the conducting surface show a clear superconducting gap structure. its functional form is of V-shaped similarly to kappa-(BEDT-TTF)(2)X and suggests the anisotropic superconducting gap with line nodes. For lateral surfaces the shape of tunneling spectra varies from the U-shape with relatively large gap to the V-shape with small gap depending on the tunneling direction alternately twice between directional angle 0 and pi. From the analysis of conductance curve taking the k dependence of the tunneling probability into account, it is found that the gap has maximum near the a* and c* axes and the nodes appear along near a* + c* and the a-c* directions. These indicate that the d(x)(-y)(2)(2) like superconducting pair is formed in this system as the case of kappa-(BEDT-TTF)(2)X. This node direction is consistent with the theoretical prediction based on the spin fluctuation mechanism. However, the zero-bias conductance peak has not been observed yet.
机译：我们已经使用扫描隧道显微镜（STM）研究了β-（BDA-TTP）（2）SbF6超导相中的间隙对称性。在导电表面上获得的隧穿光谱显示出清晰的超导间隙结构。其功能形式类似于Kappa-（BEDT-TTF）（2）X呈V形，并暗示了带有线节点的各向异性超导间隙。对于侧面，隧穿波谱的形状从具有较大间隙的U形到具有小间隙的V形，这取决于隧穿方向在方向角0和π之间交替两次。从电导曲线的分析中，考虑到隧穿概率的k依赖性，发现间隙在a *和c *轴附近最大，并且节点沿着a * + c *和a-c *方向出现。这些表明，像kappa-（BEDT-TTF）（2）X的情况一样，在该系统中形成了类似d（x）（-y）（2）（2）（2）的超导对。该节点方向与基于自旋波动机制的理论预测一致。但是，尚未观察到零偏电导峰。

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