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Investigation of dimensionality in superconducting NbN thin film samples with different thicknesses and NbTiN meander nanowire samples by measuring the upper critical field

引用

Chinese Physics B 2020年第8期29卷 457-464页

作者： Mudassar Nazir 杨晓燕田焕芳宋鹏涛王战相忠诚郭学仪金贻荣尤立星郑东宁 Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology and the Center for Excellence in Superconducting ElectronicsChinese Academy of SciencesShanghai 200050China Songshan Lake Materials Laboratory Dongguan 523808China

We study superconducting properties of NbN thin film samples with different thicknesses and an ultra-thin NbTiN meander nanowire *** the ultra-thin samples,we found that the temperature dependence of upper critical field(Hc2)in parallel to surface orientation shows bending curvature close to critical temperature Tc,suggesting a two-dimensional(2D)nature of the *** 2D behavior is further supported by the angular dependence measurements of Hc2 for the thinnest *** temperature dependence of parallel upper critical field for the thick films could be described by a model based on the anisotropic Ginzburg-Landau ***,the results measured in the field perpendicular to the film surface orientation show a similar bending curvature but in a much narrow temperature region close to Tc for the ultra-thin *** suggest that this feature could be due to suppression of pair-breaking caused by local *** further propose the temperature dependence of perpendicular Hc2 as a measure of uniformity of superconducting ultra-thin *** the thick samples,we find that Hc2 shows maxima for both parallel and perpendicular *** Hc2 peak for the perpendicular orientation is believed to be due to the columnar structure formed during the growth of the thick *** presence of columnar structure is confirmed by transmission electron microscopy(TEM).In addition,we have measured the angular dependence of magneto-resistance,and the results are consistent with the Hc2 data.

关键词： NbN micro-bridges and NbTiN meander nanowire upper critical field low dimensionality anisotropic magneto-resistance

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