d-wave pair symmetry in the superconductivity of κ-(BEDT-TTF)2X
d-wave pair symmetry in the superconductivity of κ-(BEDT-TTF)2X
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DOI：
10.1143/jpsj.75.051012
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发表时间：
2006-05
影响因子：
1.7
通讯作者：
K. Ichimura;K. Nomura
中科院分区：
文献类型：
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作者：
K. Ichimura;K. Nomura
利用扫描隧道显微镜（STM）研究了有机超导体κ-(BEDT-TTF) 2x的超导相。对κ-(BEDT-TTF) 2 Cu(NCS) 2单晶进行了导电面和侧表面的隧穿。用d波间隙对称性解释了在导电面上得到的隧穿电导曲线。隧穿光谱的温度依赖性也符合d波对称性。横向表面的隧穿光谱随隧穿方向的不同而变化，表明了隙的面内各向异性。方向依赖性也符合从k b轴和k c轴的线节点π/4的d波对称性。结果表明，超导对波函数具有dx2 - y2波对称性。(如果我们对磁布里渊区采取相同的约定，因为高T- c铜与d × 2 - y - 2波对称，κ-（BEDT-TTF) 2 Cu(NCS) 2的间隙对称是d × y -波对称。）原型……
The superconducting phase of organic superconductors κ-(BEDT-TTF) 2 X was studied by the electron tunneling using scanning tunneling microscope (STM). Tunneling both at the conducting plane and lateral surfaces was performed on single crystals of κ-(BEDT-TTF) 2 Cu(NCS) 2 . Tunneling conductance curve obtained at the conducting plane is explained by the d -wave gap symmetry. The temperature dependence of tunneling spectra is also consistent with the d -wave symmetry. Tunneling spectra at lateral surfaces varies depending on the tunneling direction, suggesting the in-plane anisotropy of the gap. The directional dependence is also consistent with the d -wave symmetry with line nodes π/4 from the k b - and k c -axes. It indicates that the superconducting pair wave function has the d x 2 - y 2 -wave symmetry. (If we take the same conventions for the magnetic Brillouin zone as high- T c cuprates with the d x 2 - y 2 -wave symmetry, the gap symmetry of κ-(BEDT-TTF) 2 Cu(NCS) 2 is the d x y -wave symmetry.) Proto...