Calorimetric evidence for enhancement of homogeneity in high performance Sr1-xKxFe2As2 superconductors. (September 2017)

• Record Type: Journal Article
• Authors: Dong, Chiheng; Yao, Chao; Huang, He; Zhang, Xianping; Wang, Dongliang; Ma, Yanwei
• Is Part Of: Scripta materialia. Number 138(2017)
• Page Start: 114
• Page End: 119
• Publication Date: 2017-09
• Subjects: High-temperature superconductors -- Superconductivity -- Homogenization; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.05.047
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We comparatively studied the critical current density, magnetization and specific heat of the rolled and the hot-pressed Sr1 − x K x Fe2 As2 tapes. The Schottky anomaly that is obvious in the specific heat of the rolled tape disappears in the hot-pressed tape. Moreover, the hot-pressed tape has a higher fraction of superconductivity and a narrower distribution of superconducting transition temperature than the rolled tape. Combined with the magnetization data, we conclude that sintering under high pressure provides a better environment for complete chemical reaction and more homogenous dopant distribution, which is beneficial to the global current of a superconductor. Graphical abstract: