Novel vortex phases in superconductivity investigated by scanning Hall probe microscopy technique

IF 1.6 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

The European Physical Journal B Pub Date : 2025-05-10 DOI:10.1140/epjb/s10051-025-00935-0

Hussein Ali Mohammed, Nada Mansoor Hassan, Sufian Mohammed Nayif

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Abstract

This study investigated the characteristics of co-doped Sr-122 iron-based superconductors and single-crystal samples were examined using high-resolution scanning Hall probe microscopy (SHPM). In this study, we used a particular method to evaluate the formation of isolated vortices by looking at how temperature changes impact the fields' penetration depth, which we represented as λ(T). We calculated the temperature's superfluid density using this dataset. When contrasting it with the two-band superconductor predictions of the α model, the parameters generated by the fitting procedure could offer important information on the electrons' symmetry of the order parameter. In crystals made of iron, hole pockets play a major role in determining the superfluid density. Low pinning forces of field, which are many orders smaller in magnitude than values reported by other methods for identical superconducting crystals, have been estimated using vortex displacements from a perfect triangular lattice.

Graphical abstract

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扫描霍尔探针显微技术研究超导中的新型涡旋相

本文研究了共掺杂Sr-122铁基超导体的特性，并利用高分辨率扫描霍尔探针显微镜（SHPM）对单晶样品进行了检测。在这项研究中，我们使用了一种特殊的方法来评估孤立漩涡的形成，通过观察温度变化如何影响场的穿透深度，我们将其表示为λ(T)。我们用这个数据集计算了温度的超流体密度。将其与α模型的双带超导体预测相比较，拟合过程产生的参数可以提供电子序参量对称性的重要信息。在由铁制成的晶体中，孔袋在决定超流体密度方面起着主要作用。利用完美三角晶格的涡旋位移估计出了低场钉住力，其量级比其他方法报道的相同超导晶体的值小许多个数量级。图形抽象

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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