Simultaneous achievement of high Jc and suppressed Jc anisotropy by hybrid pinning in YBa2Cu3O7 three-phase-nanocomposite film
Simultaneous achievement of high Jc and suppressed Jc anisotropy by hybrid pinning in YBa2Cu3O7 three-phase-nanocomposite film
复制标题
通过 YBa2Cu3O7 三相纳米复合薄膜中的混合钉扎同时实现高 Jc 和抑制 Jc 各向异性
DOI：
10.1088/1361-6668/aba544
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发表时间：
2020
影响因子：
3.6
通讯作者：
Matsumoto Kaname
中科院分区：
文献类型：
--
作者：
Horide Tomoya;Torigoe Kenta;Ishimaru Manabu;Kita Ryusuke;Awaji Satoshi;Matsumoto Kaname
将纳米钉钉中心引入到YBCO薄膜和带中，以提高涂层导体的涡流钉钉和临界电流密度（J c）。目前主要研究的是单一钉钉中心的钉钉，而多种钉钉中心的混合钉钉有望同时实现高J - c值和抑制J - c各向异性。在本研究中，制备了一种由YBCO基质、bafo3纳米棒和YO纳米颗粒组成的三相纳米复合膜。在4.2 K条件下，bafo3纳米棒与YO纳米颗粒的混合钉扎获得了1.57 TN m−3的最大整体钉扎力（F p, max，其中F p= J c B），达到了创纪录的F p， max水平。此外，杂化钉钉提高了jc的角依赖性，纳米颗粒的钉钉贡献随着温度的降低而增加，这可以解释低温下高jc的原因。因此，本研究成功地展示了一种高效的结构，可以同时实现抑制的J c各向异性和创纪录的J c水平。
Nanoscale pinning centers are introduced into YBa 2 Cu 3 O 7 (YBCO) films and tapes to improve vortex pinning and critical current density (J c) for coated conductor application. While pinning with a single type of pinning center has been mainly investigated, hybrid pinning with multiple types of pinning center is expected to be more promising for simultaneously achieving high J c values and suppressing J c anisotropy. In the present study, a three-phase-nanocomposite film consisting of an YBCO matrix, BaHfO 3 nanorods and YO nanoparticles was fabricated. A global pinning force maximum (F p, max, where F p= J c B) of 1.57 TN m− 3 at 4.2 K, which is as high as the record level of F p, max, was achieved by the hybrid pinning of BaHfO 3 nanorods and YO nanoparticles. Furthermore, the hybrid pinning improved the angular dependence of J c. The pinning contribution from nanoparticles increased with lowering temperature, which can explain the high J c at low temperature. Thus, the present study successfully demonstrates a highly effective structure that can simultaneously achieve suppressed J c anisotropy and a record level of J c.