title: Strongly enhanced current densities in Sr0.6K0.4Fe2As2 + Sn superconducting tapes.
abstract: Improving transport current has been the primary topic for practical application of superconducting wires and tapes. However, the porous nature of powder-in-tube (PIT) processed iron-based tapes is one of the important reasons for low critical current density (Jc) values. In this work, the superconducting core density of ex-situ Sr0.6K0.4Fe2As2 + Sn tapes, prepared from optimized precursors, was significantly improved by employing a simple hot pressing as an alternative route for final sintering. The resulting samples exhibited optimal critical temperature (Tc), sharp resistive transition, small resistivity and high Vickers hardness (Hv) value. Consequently, the transport Jc reached excellent values of 5.1 × 10(4) A/cm(2) in 10 T and 4.3 × 10(4) A/cm(2) in 14 T at 4.2 K, respectively. Our tapes also exhibited high upper critical field Hc2 and almost field-independent Jc. These results clearly demonstrate that PIT pnictide wire conductors are very promising for high-field magnet applications.
authors.affiliation: Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, PO Box 2703, Beijing 100190, China.
authors.forename: He
authors.initials: H
authors.lastname: Lin
authors.affiliation: Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, PO Box 2703, Beijing 100190, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Yao
authors.affiliation: Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, PO Box 2703, Beijing 100190, China.
authors.forename: Xianping
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, PO Box 2703, Beijing 100190, China.
authors.forename: Haitao
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, PO Box 2703, Beijing 100190, China.
authors.forename: Dongliang
authors.initials: D
authors.lastname: Wang
authors.affiliation: Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, PO Box 2703, Beijing 100190, China.
authors.forename: Qianjun
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, PO Box 2703, Beijing 100190, China.
authors.forename: Yanwei
authors.initials: Y
authors.lastname: Ma
authors.affiliation: High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Awaji
authors.affiliation: High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Watanabe