倾斜磁场中六硼化钇单晶的表面超导态
Surface superconducting states in yttrium hexaboride single crystal in a tilted magnetic field
摘要：
本文报道了在倾斜直流磁场中$_6$单晶表面超导形核的实验研究结果。最近开发的实验技术，使我们能够确定$H_{c3}$在每一侧的样品作为一个函数的直流磁场和表面之间的角度。实验表明，在垂直于表面直流场的方向上的比率$H_{c3}/ H_{c2}\approx 1.28 $，而根据理论，该比率应等于1。这种明显的区别不能归因于表面粗糙度。
英文摘要：
We present the results of an experimental study of the nucleation of superconductivity at the surface of a single crystal YB$_6$ in a tilted dc magnetic field. A recently developed experimental technique allowed us to determine $H_{c3}$ at each side of the sample as a function of the angle between the dc magnetic field and the surface. Experiment shows that the ratio $H_{c3}/ H_{c2}\approx 1.28 $ in the direction perpendicular to the surface dc field while according to the theory this ratio should be equal to 1. This sharp distinction cannot be ascribed to the surface roughness.
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