arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.13120cond-mat.supr-concond-mat.str-el
收藏

铜酸盐phase diagram的过掺杂端

The overdoped end of the cuprate phase diagram

Thomas A. Maier, Seher Karakuzu, Douglas J. Scalapino

摘要:

研究铜氧化物相图的过掺杂区域末端的超导性消失,为研究这些材料中负责配对的相互作用提供了一种不同的方法。在欠掺杂区,这个问题是复杂的电荷和条纹有序相的存在,以及赝隙。在过掺杂区的情况似乎更简单,只有正常相,超导相和杂质散射。在这里,对于过掺杂区,我们报告的结果相结合的动态集团近似(DCA)和弱玻恩杂质散射计算的$t-t'-U$哈伯德模型。我们发现,在两个粒子散射顶点的$d$ -波配对强度的减少是紧密耦合的磁自旋波动的动量和频率结构的变化,作为系统是过掺杂。在无序BCS $d$波近似下处理杂质散射,我们看到$d$波配对强度的降低和弱杂质散射的综合效应如何导致$T_c$圆顶的结束。

英文摘要:

Studying the disappearance of superconductivity at the end of the overdoped region of the cuprate phase diagram offers a different approach for investigating the interaction which is responsible for pairing in these materials. In the underdoped region this question is complicated by the presence of charge and stripe ordered phases as well as the pseudogap. In the overdoped region the situation appears simpler with only a normal phase, a superconducting phase and impurity scattering. Here, for the overdoped region, we report the results of a combined dynamic cluster approximation (DCA) and a weak Born impurity scattering calculation for a $t-t'-U$ Hubbard model. We find that a decrease in the $d$-wave pairing strength of the two-particle scattering vertex is closely coupled to changes in the momentum and frequency structure of the magnetic spin fluctuations as the system is overdoped. Treating the impurity scattering within a disordered BCS $d$-wave approximation, we see how the combined effects of the decreasing $d$-wave pairing strength and weak impurity scattering lead to the end of the $T_c$ dome.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑