超导铌中涡旋晶格动力学的时间分辨频闪中子散射
Time Resolved Stroboscopic Neutron Scattering of Vortex Lattice Dynamics in Superconducting Niobium
摘要：
超导涡旋晶格，玻璃和液体作为结晶的模型系统和作为超导性质的微观信息的来源引起了极大的兴趣。我们报告的第一次使用时间分辨小角中子散射的超纯铌的涡旋晶格倾斜模量C44的直接显微测量。除了一个总的趋势，以更快的涡旋晶格动力学的温度升高，我们观察到一个戏剧性的转变与非平凡的涡旋晶格形态在中间混合状态的弛豫过程。这种转变是由于在样品的表面处的舒布尼科夫域的朗道分支。我们的研究代表了一个展示如何直接访问涡旋晶格熔化和涡旋物质态的形成为其他系统。
英文摘要：
Superconducting vortex lattices, glasses and liquids attract great interest as model systems of crystallization and as a source of microscopic information of the nature of superconductivity. We report for the first time direct microscopic measurements of the vortex lattice tilt modulus c44 in ultra-pure niobium using time-resolved small angle neutron scattering. Besides a general trend to faster vortex lattice dynamics for increasing temperatures we observe a dramatic changeover of the relaxation process associated with the non-trivial vortex lattice morphology in the intermediate mixed state. This changeover is attributed to a Landau-branching of the Shubnikov domains at the surface of the sample. Our study represents a showcase for how to access directly vortex lattice melting and the formation of vortex matter states for other systems.
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