Superconductivity in hexagonal Nb-Mo-Ru-Rh-Pd high-entropy alloys. (June 2020)

• Record Type: Journal Article
• Authors: Liu, Bin; Wu, Jifeng; Cui, Yanwei; Zhu, Qinqing; Xiao, Guorui; Wu, Siqi; Cao, Guanghan; Ren, Zhi
• Is Part Of: Scripta materialia. Number 182(2020)
• Page Start: 109
• Page End: 113
• Publication Date: 2020-06
• Subjects: High-entropy alloys -- Hexagonal structure -- Superconductivity; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.03.004
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Abstract: We report the superconducting properties of new hexagonal Nb 10 + 2 x Mo 35 − x Ru 35 − x Rh10 Pd10 high-entropy alloys (HEAs) (0 ≤ x ≤ 5). With increasing x, the superconducting transition temperature T c shows a maximum of 6.19 K at x = 2.5, while the zero-temperature upper critical field B c2 (0) increases monotonically, reaching 8.3 T at x = 5. For all x values, the specific heat jump deviates from the Bardeen-Cooper-Schreiffer behavior. In addition, we show that T c of these HEAs is not determined mainly by the density of states at the Fermi level and would be enhanced by lowering the valence electron concentration.