Zhang-Rice singlets dominate critical temperature evolution of cuprate superconductivity

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED Physica C-superconductivity and Its Applications Pub Date : 2024-07-24 DOI:10.1016/j.physc.2024.1354572

Yong-Jun Chen

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Abstract

We show that formation of Zhang-Rice singlets (ZRS) naturally explains the empirical superconducting dome by random distribution of holes in copper-oxygen plane of cuprates. A general relation T_c/T_cmax=25(c-0.04), where c is the concentration of the ZRS and T_cmax is the maximum of critical temperature T_c, is obtained and reproduces the doping-dependent critical temperature evolution in the whole superconducting dome. The relation has been applied to estimate the effects of impurities substituting copper in the copper-oxygen plane. Our relation successfully predicts the suppression of superconductivity due to the substitution of Cu by the impurities. We demonstrate that T_c decreases linearly with the increase of the impurity concentration and the scattering range plays a key role in the suppression of the superconductivity. These results agree well with the experimental observations of the substitutions by Zinc and Nickel. Our relation is universal for all families of cuprates and explains the formation of the superconducting dome in the phase diagram.

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张-瑞斯单晶主导杯状超导临界温度演化

我们的研究表明，Zhang-Rice 单晶（ZRS）的形成自然地解释了铜氧化物铜氧面上空穴随机分布的经验超导圆顶。我们得到了一个一般关系式 T/T=25(c-0.04)，其中 c 是 ZRS 的浓度，T 是临界温度 T 的最大值。该关系式已被用于估算铜-氧平面中替代铜的杂质的影响。我们的关系式成功地预测了由于杂质对铜的替代而导致的超导性抑制。我们证明，T 随杂质浓度的增加而线性降低，而散射范围在超导性抑制中起着关键作用。这些结果与锌和镍替代的实验观察结果非常吻合。我们的关系对所有系列的铜氧化物都是通用的，并解释了相图中超导圆顶的形成。

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来源期刊

Physica C-superconductivity and Its Applications 物理-物理：应用

CiteScore

2.70

自引率

11.80%

发文量

102

审稿时长

66 days

期刊介绍： Physica C (Superconductivity and its Applications) publishes peer-reviewed papers on novel developments in the field of superconductivity. Topics include discovery of new superconducting materials and elucidation of their mechanisms, physics of vortex matter, enhancement of critical properties of superconductors, identification of novel properties and processing methods that improve their performance and promote new routes to applications of superconductivity. The main goal of the journal is to publish: 1. Papers that substantially increase the understanding of the fundamental aspects and mechanisms of superconductivity and vortex matter through theoretical and experimental methods. 2. Papers that report on novel physical properties and processing of materials that substantially enhance their critical performance. 3. Papers that promote new or improved routes to applications of superconductivity and/or superconducting materials, and proof-of-concept novel proto-type superconducting devices. The editors of the journal will select papers that are well written and based on thorough research that provide truly novel insights.