论文标题
yba $ _2 $ cu $ _3 $ o $ _ {7-d} $微结构粒子
Reentrant superconductivity in YBa$_2$Cu$_3$O$_{7-d}$ microstructured particles
论文作者
论文摘要
由于其大小和微观结构，在YBCO颗粒中观察到了重进入超导效应。它是由于散装超导性与表面铁磁势之间的共存，在该层中，在结构缺陷附近的层中损坏的空间内对称对称性引起的增强的磁磁耦合在结构缺陷附近的对称性上起着非常重要的作用，这在表面铁磁症上起着非常重要的作用。该研究假设颗粒内的晶界充当增强铁磁特性的其他表面区域。研究了磁性和超导能作为粒径的函数。特别是385 nm颗粒，即表现出重进入超导效应的颗粒。 Ginzburg-Landau参数和关键温度为$ K \ SIM 1.29 $，T $ _ {C1} $ = 92 $ \ pm $ 5 K，而T $ _ {C2} $ = 10 $ \ pm $ 3 K.
A reentrant superconducting effect was observed in YBCO particles as a consequence of their size and microstructure. It rises from the coexistence between bulk superconductivity and surface ferromagnetism, where the enhanced magneto-electric coupling induced by broken spatial-inversion symmetry in layers near structural defects plays a very important role on surface ferromagnetism. The study assumes grain boundaries inside the particles act as additional surface regions that enhance the ferromagnetic properties. Magnetic and superconducting properties as a function of particle size were studied. Particularly, the 385 nm particles which were the ones that exhibited the reentrant superconducting effect. The Ginzburg-Landau parameter and the critical temperatures are $k \sim 1.29$, T$_{c1}$ = 92 $\pm$ 5 K, and T$_{c2}$ = 10 $\pm$ 3 K.
