Upward shift of the vortex solid phase in high-temperature-superconducting wires through high density nanoparticle addition.
Upward shift of the vortex solid phase in high-temperature-superconducting wires through high density nanoparticle addition.
复制标题
涡流固相在高密度纳米颗粒的添加中向上移动。
DOI：
10.1038/srep20436
复制
发表时间：
2016-02-08
影响因子：
4.6
通讯作者：
Civale L
中科院分区：
文献类型：
--
作者：
Miura M;Maiorov B;Balakirev FF;Kato T;Sato M;Takagi Y;Izumi T;Civale L
我们展示了一种简单而有效的方法来提高涡旋不可逆线非常高的磁场（60 T），通过增加第二相BaZrO 3纳米粒子的密度。采用金属有机物沉积法在不同BaZrO 3纳米颗粒浓度的金属基底上制备了（Y 0. 77，Gd 0. 23）Ba 2Cu 3 Oy薄膜。我们发现，在增加的BaZrO 3浓度，纳米粒子的尺寸保持不变，但孪晶界密度增加。直到最高纳米颗粒浓度（n ~ 1.3 × 1022/m3），不可逆场（Hirr）继续增加，直到60 T没有饱和的迹象，尽管涡旋的数量大大超过钉扎中心。我们发现Hirr极高，即Hirr = 30 T（H|| 45°）和24 T（H|| c）在65 K和58 T（H）下||45°）和45 T（H|| C. 50K。钉扎景观的差异转移的旋涡固-液过渡向上，增加了有用的功率应用的旋涡区域，同时保持上临界场，临界温度和电子质量各向异性不变。
We show a simple and effective way to improve the vortex irreversibility line up to very high magnetic fields (60T) by increasing the density of second phase BaZrO3 nanoparticles. (Y0.77,Gd0.23)Ba2Cu3Oy films were grown on metal substrates with different concentration of BaZrO3 nanoparticles by the metal organic deposition method. We find that upon increase of the BaZrO3 concentration, the nanoparticle size remains constant but the twin-boundary density increases. Up to the highest nanoparticle concentration (n ~ 1.3 × 1022/m3), the irreversibility field (Hirr) continues to increase with no sign of saturation up to 60 T, although the vortices vastly outnumber pinning centers. We find extremely high Hirr, namely Hirr = 30 T (H||45°) and 24 T (H||c) at 65 K and 58 T (H||45°) and 45 T (H||c) at 50K. The difference in pinning landscape shifts the vortex solid-liquid transition upwards, increasing the vortex region useful for power applications, while keeping the upper critical field, critical temperature and electronic mass anisotropy unchanged.