Jiang Hong-Min, Chen Cui-Ping, Li Jian-Xin
National Laboratory of Solid State of Microstructure and Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
J Phys Condens Matter. 2009 Sep 16;21(37):375701. doi: 10.1088/0953-8984/21/37/375701. Epub 2009 Aug 17.
We investigate the superconducting order parameter, the spectral and optical properties in a stripe model with spin-(charge-) domain-derived scattering potential V(s) (V(c)). We show that the charge-domain-derived scattering is less effective than the spin scattering on the suppression of superconductivity. For [Formula: see text], the spectral weight concentrates on the (π,0) antinodal region and a finite energy peak appears in the optical conductivity with the disappearance of the Drude peak. But for V(s)≈V(c), the spectral weight concentrates on the (π/2,π/2) nodal region and a residual Drude peak exists in the optical conductivity without the finite energy peak. These results consistently account for the divergent observations in the ARPES and optical conductivity experiments in several high- T(c) cuprates and suggest that the 'insulating' and 'metallic' properties are intrinsic to the stripe state, depending on the relative strength of the spin- and charge-domain-derived scattering potentials.
我们研究了具有自旋（电荷）域衍生散射势V(s)（V(c)）的条纹模型中的超导序参量、光谱和光学性质。我们表明，电荷域衍生散射在抑制超导性方面比自旋散射效果更差。对于[公式：见正文]，光谱权重集中在(π,0)反节点区域，并且随着德鲁德峰的消失，光导率中出现有限能量峰。但对于V(s)≈V(c)，光谱权重集中在(π/2,π/2)节点区域，并且光导率中存在残余德鲁德峰而没有有限能量峰。这些结果一致地解释了在几种高温铜酸盐的角分辨光电子能谱（ARPES）和光导率实验中的不同观测结果，并表明“绝缘”和“金属”性质是条纹态所固有的，这取决于自旋和电荷域衍生散射势的相对强度。
