Topological solitons in charge-6e flux quantized state of Kagome superconductors

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED Physica C-superconductivity and Its Applications Pub Date : 2024-05-24 DOI:10.1016/j.physc.2024.1354512

Ling-Feng Zhang , Zi-Hao Zhou , Qing Huang

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Abstract

A recent Little-Parks experiment on the new Kagome superconductor CsV $_{3}$ Sb $_{5}$ demonstrated resistance oscillation with a period of $ϕ_{0} / 3 = h c / 6 e$ . This observation of charge- $6 e$ flux quantization is effectively explained by a three-component Ginzburg–Landau (GL) model that incorporates second-order Josephson-type couplings. Here, we numerically solve the GL model to present stable topological solitons. We reveal the structures of these solitons, characterized by closed domain walls with attached vortices. We identify two types of domain walls. These solitons possess multiple flux quanta and exhibit a ringlike geometry. Furthermore, we present the characteristic magnetic field distributions of these solitons, enabling their identification in, e.g., scanning Hall probe and scanning SQUID experiments.

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卡戈米超导体电荷-6e 通量量化态中的拓扑孤子

最近在新型卡戈米超导体 CsV3Sb5 上进行的 Little-Parks 实验显示了周期为 ϕ0/3=hc/6e 的电阻振荡。这种电荷-6e 通量量子化观测结果可以用包含二阶约瑟夫森耦合的三分量金兹堡-朗道（GL）模型来有效解释。在此，我们对 GL 模型进行数值求解，以呈现稳定的拓扑孤子。我们揭示了这些孤子的结构，其特点是具有附着涡流的封闭域壁。我们确定了两种类型的畴墙。这些孤子拥有多个磁通量子，并呈现出环状几何结构。此外，我们还展示了这些孤子的磁场分布特征，从而能够在扫描霍尔探针和扫描 SQUID 等实验中识别它们。

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来源期刊

Physica C-superconductivity and Its Applications 物理-物理：应用

CiteScore

2.70

自引率

11.80%

发文量

102

审稿时长

66 days

期刊介绍： Physica C (Superconductivity and its Applications) publishes peer-reviewed papers on novel developments in the field of superconductivity. Topics include discovery of new superconducting materials and elucidation of their mechanisms, physics of vortex matter, enhancement of critical properties of superconductors, identification of novel properties and processing methods that improve their performance and promote new routes to applications of superconductivity. The main goal of the journal is to publish: 1. Papers that substantially increase the understanding of the fundamental aspects and mechanisms of superconductivity and vortex matter through theoretical and experimental methods. 2. Papers that report on novel physical properties and processing of materials that substantially enhance their critical performance. 3. Papers that promote new or improved routes to applications of superconductivity and/or superconducting materials, and proof-of-concept novel proto-type superconducting devices. The editors of the journal will select papers that are well written and based on thorough research that provide truly novel insights.