管内粉末法制备的 BaNaFeAs 带材中高度 c 轴取向的超导芯和大临界电流密度

Highly c-axis orientated superconducting core and large critical current density in BaNaFeAs powder-in-tube tape.

作者信息

Imai S, Itou S, Ishida S, Tsuchiya Y, Iyo A, Eisaki H, Matsuzaki K, Nishio T, Yoshida Y

机构信息

Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan.

National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8568, Japan.

出版信息

Sci Rep. 2019 Sep 10;9(1):13064. doi: 10.1038/s41598-019-49363-y.

DOI:10.1038/s41598-019-49363-y

PMID:31506470

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6736839/

Abstract

Improvement of the critical current density (J) of superconducting wires/tapes is one of the key issues in the field of superconductivity applications. Here we report the fabrication of a silver-sheathed BaNaFeAs (BaNa-122) superconducting tape by using a powder-in-tube technique and its superconducting properties, in particular transport J, as well as the tape-core texture. The optimally-doped BaNa-122 tape with Na concentration x = 0.4 exhibits the superconducting critical temperature (T) of 33.7 K and high transport J of 4 × 10 A/cm at 4.2 K in a magnetic field of 4 T. Patterns of x-ray diffraction for the superconducting core show that the degree of c-axis orientation is significantly enhanced through the tape fabrication process. The tendency of c-axis orientation is advantageous for achieving higher J, suggesting the high potential of BaNa-122 for superconducting wire/tape applications.

摘要

提高超导线材/带材的临界电流密度（J）是超导应用领域的关键问题之一。在此，我们报告了采用管内粉末技术制备银包套BaNaFeAs（BaNa-122）超导带材及其超导性能，特别是输运J以及带材芯部织构。Na浓度x = 0.4的最佳掺杂BaNa-122带材在4 T磁场中于4.2 K时表现出33.7 K的超导临界温度（T）和4×10 A/cm的高输运J。超导芯部的x射线衍射图谱表明，通过带材制备过程，c轴取向程度显著提高。c轴取向趋势有利于实现更高的J，这表明BaNa-122在超导线材/带材应用方面具有很大潜力。