Spin fluctuations in conventional superconductors and anomalous isotope effect in PdH and PdD

IF 1.3 3区 物理与天体物理 Q4 PHYSICS, APPLIED Physica C-superconductivity and Its Applications Pub Date : 2024-10-30 DOI:10.1016/j.physc.2024.1354602
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Abstract

Spin fluctuations have been suggested to be an influence to the superconducting phenomenon, either favorably or disruptively. Consequently, we study the role of magnons in the thermodynamics of conventional superconductors proposing a relationship between magnetization and electron-magnon coupling (λem) for vanadium, niobium, lead, palladium, and the PdX (where X= hydrogen, deuterium, and tritium) systems. We suggest a different relationship for the Coulomb pseudopotential (μN), which is influenced by the characteristic frequency (ωln). In this way, the critical temperatures (Tc) of the elements studied and the PdX compounds are very close to those reported experimentally. The PdH, PdD and PdT compounds have shown critical temperatures of 9.05 K, 12.20 K and 12.90 K, respectively. Finally, we determine the behavior of Tc for PdX under hydrostatic pressures up to 10 GPa, showing an alternative explanation for the anomalous isotope effect in PdH and PdD compounds. Our study was carried out by numerically solving the linearized Migdal-Eliashberg equations coupling the Bogoliubov-de-Gennes method, while the magnetic excitation was calculated using linear response time dependent within the Density Functional Theory, framework, both implemented in the Elk code.
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传统超导体中的自旋波动以及 PdH 和 PdD 中的异常同位素效应
自旋波动被认为对超导现象具有有利或破坏性的影响。因此,我们研究了磁子在传统超导体热力学中的作用,为钒、铌、铅、钯和 PdX(其中 X= 氢、氘和氚)系统提出了磁化与电子磁子耦合(λem)之间的关系。我们建议库仑假势(μN∗)采用不同的关系,它受特征频率(ωln)的影响。因此,所研究元素和 PdX 化合物的临界温度 (Tc) 与实验报告的温度非常接近。PdH、PdD 和 PdT 化合物的临界温度分别为 9.05 K、12.20 K 和 12.90 K。最后,我们确定了 PdX 在高达 10 GPa 的静水压力下的 Tc 行为,为 PdH 和 PdD 化合物中的异常同位素效应提供了另一种解释。我们的研究是通过与 Bogoliubov-de-Gennes 方法耦合的线性化 Migdal-Eliashberg 方程的数值求解进行的,而磁激发则是在密度泛函理论框架内使用线性响应时间相关性进行计算的,两者均在 Elk 代码中实现。
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来源期刊
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.
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