We studied the effect of artificial pinning centers in the form of nanoinclusions of stannate BaSnO₃ (BSO) and zirconate BaZrO₃ (BZO) barium on the critical current of high-temperature superconducting tapes of the second generation (2G) based on YBa₂Cu₃O 7−δ films (YBCO). It has been found that the introduction of BaZrO₃ nanoinclusions increases the critical current at 77 K for the magnetic field direction parallel and normal to the tape surface, while the introduction of BaSnO₃ nanoinclusions decreases the critical current in both cases. To elucidate the origin of a different impact of nanoinclusions we examined the local structure of the YBCO-matrix using x-ray absorption spectroscopy (EXAFS and XANES). The spectra were collected at K-edges of Cu, Sn, and Zr at the European Synchrotron (ESRF). It was revealed that the introduction of BaZrO₃ nanoinclusions increases the stiffness of copper–oxygen bonds in superconducting CuO₂ plane and minimizes their static disorder in the YBCO matrix, while the introduction of BaSnO₃ nanoinclusions leads to a significant increase in static disorder with a relatively weak effect on the stiffness of Cu–O bonds. These changes in the local structure become decisive for changing the macroscopic properties of high-temperature superconductor-tapes.

中文翻译：

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BaSnO3 和 BaZrO3 纳米夹杂物对高温超导涂层导体临界电流和局部结构的影响

_{我们研究了锡酸 BaSnO 3} (BSO) 和锆酸 BaZrO ₃ (BZO) 钡纳米夹杂物形式的人工钉扎中心对基于 YBa ₂ Cu的第二代 (2G) 高温超导带的临界电流的影响₃欧 7−δ 电影（YBCO）。已经发现，对于平行于和垂直于带表面的磁场方向， BaZrO _{3纳米夹杂物的引入增加了77K处的临界电流，而BaSnO 3}纳米夹杂物的引入降低了两种情况下的临界电流。为了阐明纳米夹杂物不同影响的起源，我们使用 X 射线吸收光谱（EXAFS 和 XANES）检查了 YBCO 基质的局部结构。光谱收集于钾-欧洲同步加速器 (ESRF) 中 Cu、Sn 和 Zr 的边缘。结果表明，BaZrO _{3纳米夹杂物的引入增加了超导 CuO 2}平面中铜氧键的刚度，并最大限度地减少了 YBCO 基体中的静态无序，而 BaSnO ₃纳米夹杂物的引入导致静态无序显着增加，对 Cu-O 键刚度的影响相对较弱。这些局部结构的变化对于改变高温超导带的宏观性能具有决定性作用。