Gap renormalization in dirty anisotropic superconductors: Implications for the order parameter of the cuprates.
Gap renormalization in dirty anisotropic superconductors: Implications for the order parameter of the cuprates.
复制标题
脏各向异性超导体中的能隙重正化：对铜酸盐有序参数的影响。
DOI：
10.1103/physrevb.50.3495
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
Norman Mr
中科院分区：
文献类型：
--
作者：
R. Fehrenbacher;Norman Mr
我们对比了杂质对具有[ital d][sub [ital x][sup 2][minus][ital y][sup 2]]序参数和具有相同节结构的高度各向异性[ital s]波（ASW）间隙的超导体性质的影响。在ASW状态的非零，杂质引起的，非对角自能被示出为抑制清洁系统中存在的低能量激发，导致与[ital d][sub [ital x][sup 2][minus][ital y][sup 2]]状态相比，单粒子态密度的定性不同的杂质响应。我们讨论了如何利用这种行为来区分一个国家从其他高分辨率角分辨光电子能谱的分析。
We contrast the effects of nonmagnetic impurities on the properties of superconductors having a [ital d][sub [ital x][sup 2][minus][ital y][sup 2]] order parameter, and a highly anisotropic [ital s]-wave (ASW) gap with the same nodal structure. The nonvanishing, impurity-induced, off-diagonal self-energy in the ASW state is shown to inhibit the low-energy excitations present in the clean system, leading to a qualitatively different impurity response of the single-particle density of states compared to the [ital d][sub [ital x][sup 2][minus][ital y][sup 2]] state. We discuss how this behavior can be employed to distinguish one state from the other by an analysis of high-resolution angle-resolved photoemission spectra.