TY - JOUR
T1 - Improving Superconducting Performance of Fe(Se, Te) with in Situ Formed Grain-Boundary Strengthening and Flux Pinning Centers
AU - Liu, Jixing
AU - Shao, Botao
AU - Liu, Xueqian
AU - Li, Meng
AU - Sang, Lina
AU - Zhang, Wen
AU - Zhang, Shengnan
AU - Feng, Jianqing
AU - Li, Chengshan
AU - Dou, Shixue
AU - Li, Jianfeng
AU - Zhang, Pingxiang
AU - Zhou, Lian
AU - Wang, Xiaolin
N1 - Publisher Copyright:
© 2022 American Chemical Society.
PY - 2022/1/12
Y1 - 2022/1/12
N2 - It is well known that the existence of interstitial Fe is a great obstacle to enhancing the superconducting properties of the Fe(Se, Te) system. In this work, a silver and oxygen codoping effect toward enhancement of the superconductivity and flux pinning in Fe(Se, Te) bulks is reported. The oxygen ions from SeO2 can induce the precipitation of interstitial Fe as Fe2O3, thus simultaneously optimizing the superconducting properties of Fe(Se, Te) and forming extra flux pinning centers, while the existence of Ag can enhance the intergrain connections of the polycrystalline material by improving the electron transport at grain boundaries. Compared with the undoped sample, the critical current density, the upper critical field, and the thermally activated flux flow activation energy are greatly enhanced by 4.7, 1.7, and 1.5 times, respectively. The novel synthesis technique and optimized properties of this work can pave the way for the development of high-performance Fe(Se, Te) superconducting wires or tapes.
AB - It is well known that the existence of interstitial Fe is a great obstacle to enhancing the superconducting properties of the Fe(Se, Te) system. In this work, a silver and oxygen codoping effect toward enhancement of the superconductivity and flux pinning in Fe(Se, Te) bulks is reported. The oxygen ions from SeO2 can induce the precipitation of interstitial Fe as Fe2O3, thus simultaneously optimizing the superconducting properties of Fe(Se, Te) and forming extra flux pinning centers, while the existence of Ag can enhance the intergrain connections of the polycrystalline material by improving the electron transport at grain boundaries. Compared with the undoped sample, the critical current density, the upper critical field, and the thermally activated flux flow activation energy are greatly enhanced by 4.7, 1.7, and 1.5 times, respectively. The novel synthesis technique and optimized properties of this work can pave the way for the development of high-performance Fe(Se, Te) superconducting wires or tapes.
KW - chemical doping
KW - critical current density
KW - Fe(Se, Te)
KW - flux pinning
KW - iron-based superconductors
UR - http://www.scopus.com/inward/record.url?scp=85122655402&partnerID=8YFLogxK
U2 - 10.1021/acsami.1c18906
DO - 10.1021/acsami.1c18906
M3 - 文章
C2 - 34978411
AN - SCOPUS:85122655402
SN - 1944-8244
VL - 14
SP - 2246
EP - 2254
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 1
ER -