从 Ab initio 和各向同性 Eliashberg 函数看 Pd-Heusler 稀土的超导特性

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED

Physica C-superconductivity and Its Applications Pub Date : 2024-05-13 DOI:10.1016/j.physc.2024.1354517

S. Mouchou , Y. Toual , A. Azouaoui , A. Rezzouk , K. Bouslykhane , A. Hourmatallah , N. Benzakour

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引用次数: 0

摘要

采用 Ab initio 方法研究了 Heusler 合金 Pd2TmSn、Pd2YbSn 和 Pd2LuSn 的结构、电子和超导特性。研究结果表明，这些合金在立方面心晶格中表现出结构和动态稳定性。各向同性的 Eliashberg 函数被用来计算超导体特性。声子-电子耦合属于中等耦合超导体的特征范围。对费米面的分析确定了连接第一布里渊区的颈部的存在，这有利于电子配对。利用艾伦-戴维斯方程计算出的超导临界温度与之前的实验和理论发现一致。

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Superconductivity properties of Pd-Heusler rare earth from ab initio and isotropic Eliashberg function

Ab initio was employed to investigate the structural, electronic, and superconducting properties of the Heusler alloys Pd $_{2}$ TmSn, Pd $_{2}$ YbSn, and Pd $_{2}$ LuSn. The results reveal that these alloys exhibit both structural and dynamic stability in a cubic face-centered lattice. The isotropic Eliashberg function was used to calculate the superconductor properties. The phonon–electron couplings fall within the range characteristic of medium-coupling superconductors. Analysis of the Fermi surfaces identifies the presence of necks connecting the first Brillouin zones, which facilitate electron pairing. The calculated superconducting critical temperatures using the Allen–Dynes equation are in agreement with previous experimental and theoretical findings.

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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.