Vortex Pinning Properties at Grain Boundary in SmBa2Cu3Oy Superconducting Films with BaHfO3 Nano-rods Controlled via Low-Temperature Growth
Vortex Pinning Properties at Grain Boundary in SmBa2Cu3Oy Superconducting Films with BaHfO3 Nano-rods Controlled via Low-Temperature Growth
复制标题
通过低温生长控制 BaHfO3 纳米棒的 SmBa2Cu3Oy 超导薄膜晶界处的涡旋钉扎特性
DOI：
10.1109/tasc.2016.2638543
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发表时间：
2017
影响因子：
1.8
通讯作者：
Akihiro Tsuruta
中科院分区：
文献类型：
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作者：
Shun Miura, Yusuke Ichino, Yutaka Yoshida;Ataru Ichinose;Akihiro Tsuruta
研究了BaHfO_3(BHO)纳米棒的构型对SmBa2Cu3Oy(SmBCO)超导薄膜中人工晶界输运性质的影响。为了控制纳米棒在基板上的构型，我们采用脉冲激光沉积法，采用种子层技术，在5°[001]倾斜双晶(LaAlO)0.3(SrAl0.5Ta0.5O3)0.7衬底上制备了体积分数为3.0%的BHO掺杂的SmBCO薄膜。输运结果表明，在低磁场下，含纳米棒的薄膜的临界电流密度(JC)有所提高。此外，在很宽的场向范围内，Jc的场角依赖关系也得到了改善，在B//c处有一个宽峰。我们估计，GBs中的BHO纳米棒钉扎了GBs中不同方向的Abrikosov-Josephson(AJ)涡旋。AJ涡旋钉扎可以通过在国标处设置钉扎中心来控制。
We investigated the effect of the BaHfO3(BHO) nanorods' configuration on transport properties at artificial grain boundaries (GBs) in SmBa2Cu3Oy(SmBCO) superconducting films. To control the nanorods' configuration at the GBs, we deposited 3.0 vol.% BHO-doped SmBCO films on 5° [001]-tilt bicrystal (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7substrates at relatively low growth temperature of 750 °C via the pulsed laser deposition method adopting a seed layer technique. According to the transport results, the critical current density (Jc) at the GBs was improved in the films with the nanorods at low magnetic fields. In addition, field angular dependence of Jc was also improved for a wide range of field directions with a broad peak for B//c. We estimated that the BHO nanorods in the GBs pinned the Abrikosov-Josephson (AJ) vortices with various directions in the GBs. AJ vortex pinning can be controlled by configuration of a pinning center at GB.