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ON THE NATURE OF THE ORDER PARAMETER IN HTSC AND INFLUENCE OF IMPURITIES

机译：高温超导中级参数的性质及其对杂质的影响

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The previously proposed model, based on the extended saddle point singularities in the electron spectrum, weak screening of the Coulomb interaction and phonon-mediated interaction between electrons, is supplemented by a small short-range repulsion of Hund's or spin-fluctuation origin. This permits one to explain the change of sign of the order parameter in a natural way and to resolve the seeming conflicts between existing experimental data. The influence of impurity scattering on T-c, the order parameter at T=0 and the density of states, including the energy gap, are studied for the same model. A simple argument shows that the small-angle scattering due to ionized impurities does not change the superconducting parameters, and all changes come from the large-angle scattering. For the vicinity of the singularity the ''out scattering'' has a small probability, since the density of states beyond the singularity is low. Therefore, the suppression of the gap in this vicinity is weak, and the same is true for T-c. On the other hand, the scattering of electrons distant from the singularity into the singular region is much larger, due to the enhanced density of states. Since the order parameter beyond the singularity is still defined by its value in the singular region, it scales with this value and varies only slightly. However, the energy gap in this region, which does not coincide with the order parameter, increases rapidly with impurity concentration so that the gap becomes isotropic in the strong scattering limit. These conclusions agree with preliminary experimental observations. [References: 27]
机译：先前提出的模型基于电子谱中扩展的鞍点奇点，电子之间库仑相互作用和声子介导的相互作用的弱屏蔽，并通过对Hund或自旋涨落的小短程排斥来补充。这使人们能够以一种自然的方式来解释阶数参数的符号变化，并解决现有实验数据之间的看似冲突。对于同一模型，研究了杂质散射对T-c，T = 0时的有序参数和状态密度（包括能隙）的影响。一个简单的论证表明，由于离子化杂质引起的小角度散射不会改变超导参数，所有变化都来自大角度散射。对于奇点附近，“向外散射”的可能性很小，因为奇点以外的状态密度很低。因此，在该附近的间隙的抑制较弱，对于T-c也同样。另一方面，由于状态密度的提高，远离奇点的电子向奇点区域的散射要大得多。由于超出奇异性的阶数参数仍由其在奇异区域中的值来定义，因此它随该值缩放并仅略有变化。但是，该区域的能隙与阶数参数不一致，随着杂质浓度的增加而迅速增加，使得该能隙在强散射极限内变为各向同性。这些结论与初步的实验观察结果一致。 [参考：27]

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