超导的掺杂依赖性和多通道介质:杯石模型的计算

IF 2.9 Q3 CHEMISTRY, PHYSICAL Electronic Structure Pub Date : 2024-07-10 DOI:10.1088/2516-1075/ad5e29
Fabian Schrodi, Alex Aperis and Peter M Oppeneer
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引用次数: 0

摘要

我们研究了铜氧化物模型系统超导性的两个方面:其掺杂依赖性和竞争配对介质的影响。我们首先在米格达尔近似之外加入了电子-声子相互作用,并在顶点校正的非相互作用态近似下,自洽地求解了全带宽、各向异性顶点校正的埃利亚斯伯格方程(作为掺杂的函数)和各向同性电子-声子耦合。我们的结果表明,这种配对相互作用支持实验观察到的超导间隙的波对称性,但仅限于掺杂空穴系统的狭窄掺杂区间。根据耦合强度的不同,我们得到了接近最佳掺杂的间隙大小和超导临界温度的实际值,从而使电子-声子机制成为介导该模型系统超导性的重要候选机制。其次,对于接近最佳空穴掺杂的掺杂,我们研究了多通道超导性,将顶点校正电子-声子相互作用以及自旋和电荷波动作为配对机制。我们发现,这两种机制相互配合,支持阶次参数的非传统 d 波对称性,然而电子-声子相互作用是库珀配对和高临界温度的主要原因。由于自旋波动在小耦合波矢量下的排斥作用,它对间隙大小和临界温度有抑制作用。
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Doping dependence and multichannel mediators of superconductivity: calculations for a cuprate model
We study two aspects of the superconductivity in a cuprate model system, its doping dependence and the influence of competing pairing mediators. We first include electron–phonon interactions beyond Migdal’s approximation and solve self-consistently, as a function of doping and for an isotropic electron–phonon coupling, the full-bandwidth, anisotropic vertex-corrected Eliashberg equations under a non-interacting state approximation for the vertex correction. Our results show that such pairing interaction supports the experimentally observed -wave symmetry of the superconducting gap, but only in a narrow doping interval of the hole-doped system. Depending on the coupling strength, we obtain realistic values for the gap magnitude and superconducting critical temperature close to optimal doping, rendering the electron–phonon mechanism an important candidate for mediating superconductivity in this model system. Second, for a doping near optimal hole doping, we study multichannel superconductivity, by including both vertex-corrected electron–phonon interaction and spin and charge fluctuations as pairing mechanisms. We find that both mechanisms cooperate to support an unconventional d-wave symmetry of the order parameter, yet the electron–phonon interaction is mainly responsible for the Cooper pairing and high critical temperature . Spin fluctuations are found to have a suppressing effect on the gap magnitude and critical temperature due to their repulsive interaction at small coupling wave vectors.
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来源期刊
CiteScore
3.70
自引率
11.50%
发文量
46
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