Microstructure and superconducting properties of high-rate PLD-derived GdBa2Cu3O7-δ coated conductors with BaSnO3 and BaZrO3 pinning centers

Alexey V Ovcharov; Pavel N Degtyarenko; Vsevolod N Chepikov; Alexander L Vasiliev; Sergey Yu Gavrilkin; Igor A Karateev; Alexey Yu Tsvetkov; Andrey R Kaul

doi:10.1038/s41598-019-51348-w

Microstructure and superconducting properties of high-rate PLD-derived GdBa₂Cu₃O_7-δ coated conductors with BaSnO₃ and BaZrO₃ pinning centers

Sci Rep. 2019 Oct 23;9(1):15235. doi: 10.1038/s41598-019-51348-w.

Authors

Alexey V Ovcharov¹, Pavel N Degtyarenko^{2

3}, Vsevolod N Chepikov^{2

4}, Alexander L Vasiliev^{5

6

7}, Sergey Yu Gavrilkin⁸, Igor A Karateev¹, Alexey Yu Tsvetkov⁸, Andrey R Kaul^{2

4}

Affiliations

¹ National Research Center "Kurchatov Institute", Moscow, 123182, Russia.
² SuperOx, Moscow, 117246, Russia.
³ Joint Institute for High Temperature of Russian Academy of Sciences, Moscow, 125412, Russia.
⁴ Lomonosov Moscow State University, Moscow, 119991, Russia.
⁵ National Research Center "Kurchatov Institute", Moscow, 123182, Russia. a.vasiliev56@gmail.com.
⁶ Shubnikov Institute of Crystallography of Russian Academy of Sciences, Moscow, 117333, Russia. a.vasiliev56@gmail.com.
⁷ Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region, 141701, Russia. a.vasiliev56@gmail.com.
⁸ P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, 119991, Russia.

Abstract

The microstructure of GdBa₂Cu₃O_7-δ based on superconducting tapes with BaSnO₃ and BaZrO₃ artificial pinning centers formed by high-rate pulse laser deposition in SuperOx Japan was studied by scanning/transmission electron microscopy. The artificial pinning centers have adopted columnar morphology with average diameter of about 8 nm (BaSnO₃-doped sample) and 6.5 nm (BaZrO₃-doped sample) and density of 500 μm^-2 for the both samples. The average length of the BaSnO₃ nanocolumns is about two times higher than the BaZrO₃ nanocolumns. The angular dependences of critical current in magnetic field up to 1 Tesla at 77 and 65 K have been obtained. The critical current and its anisotropy depend on artificial pinning centers presence and their type. The angular dependence of resistivity in the field up to 9 Tesla was also studied and discussed.