Abstract
The microstructure of GdBa2Cu3O7−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.
Highlights
The commercial production of second generation high temperature superconducting tapes (2G HTS tapes, coated conductors, CC) based on REBa2Cu3O7−δ is rapidly developing in many countries and that can be proved by large number of publications[1,2,3,4]
Www.nature.com/scientificreports sample) and those obtained at the same high rate pulse laser deposition (PLD) of GdBCO layer doped with 6 molar % BaSnO3 (BSO sample) and BaZrO3 (BZO sample) artificial pining centers (APC)
The microstructural analysis of 2 G HTS tapes demonstrates that the BSO and BZO nanocolumns are formed in the doped samples with the typical diameter of ≈8 nm and ≈6.5 nm, respectively
Summary
The commercial production of second generation high temperature superconducting tapes (2G HTS tapes, coated conductors, CC) based on REBa2Cu3O7−δ (where RE is a rare-earth element, REBCO) is rapidly developing in many countries and that can be proved by large number of publications[1,2,3,4]. One way to increase the in-field stability of CC’s critical current density, jc, at LN2 temperatures is the introduction of artificial pining centers (APC). Introduction of the APC had increased the lift-factor and significantly reduced the critical current (Ic) anisotropy in strong magnetic fields (up to 10 Tesla) at T ≫ 77 K. It is important to understand the contribution of APCs to the final pinning force value and its dependence on temperature and external magnetic field, including its orientation[16,17]. To solve this problem one have to determine the microstructural characteristics of HTS tapes with a different type of APC. The correlation of CC’s microstructure studied by transmission electron microscopy (TEM) and their superconducting characteristics was considered
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