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arXiv 1802.08299cond-mat.supr-con
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第一类超导体中间态表面附近磁场分布和磁畴形状的实验研究

Experimental study of the magnetic field distribution and shape of domains near the surface of type-I superconductors in the intermediate state

V. Kozhevnikov, A. Suter, T. Prokscha, C. Van Haesendonck

摘要:

朗道在80年前就预言了,在中间状态下,I型超导体表面附近的磁场分布不均匀性和畴壁圆度对于形成平衡磁通结构的重要性。进一步的研究证实了这一预测,并将其扩展到该状态的所有平衡性质。在这里,我们报告的直接深度分辨测量的字段分布和形状的域附近的高纯度I型(铟)膜的表面在一个垂直的领域使用低能量μ子自旋旋转光谱。我们发现,在低外加场(约为中间态场范围的一半)下,场分布和畴的形状与Tinkham提出的结果一致。然而,对于高场,我们的数据表明,现实与理论预期不同。特别地,超导薄层的宽度可以在表面附近扩展,导致在样品外部的无电流空间中的静态磁场中形成最大值。这些实验结果的可能解释进行了讨论。

英文摘要:

The importance of accounting for the inhomogeneity of the magnetic field distribution and roundness of domain walls near the surface of type-I superconductors in the intermediate state for forming the equilibrium flux structure was predicted by Landau eight decades ago. Further studies confirmed this prediction and extended it to all equilibrium properties of this state. Here we report on direct depth-resolved measurements of the field distribution and shape of domains near the surface of high-purity type-I (indium) films in a perpendicular field using Low-Energy Muon Spin Rotation spectroscopy. We find that at low applied fields (in about half of the field range of the intermediate state) the field distribution and domains' shape agrees with that proposed by Tinkham. However, for high fields our data suggest that reality differs from theoretical expectations. In particular, the width of the superconducting laminae can expand near the surface leading to formation of a maximum in the static magnetic field in the current-free space outside the sample. A possible interpretation of these experimental results is discussed.

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