YBa $_2$ Cu PDMATHAAB O $_{7-d}$微结构粒子的重入超导电性
Reentrant superconductivity in YBa$_2$Cu$_3$O$_{7-d}$ microstructured particles
摘要：
在YBCO颗粒中观察到了重入超导效应，这是由于它们的尺寸和微观结构。它起源于体相超导性与表面铁磁性的共存，其中结构缺陷附近层的空间反转对称性破缺引起的磁电耦合增强对表面铁磁性起着非常重要的作用。该研究假设颗粒内部的晶界作为额外的表面区域，增强铁磁性能。研究了磁性和超导性能随颗粒尺寸的变化。特别是，385 nm的颗粒，这是那些表现出再入超导效应。Ginzburg-Landau参数和临界温度分别为：$k \sim 1.29$，T $_{c1}$ = 92 $\pm$ 5 K，T $_{c2}$ = 10 $\pm$ 3 K.
英文摘要：
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.
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