各向异性（Ca0.85La0.15）10(Pt3As8)(Fe2As2)5单晶的玻璃弛豫和弱涡旋钉钉

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED

Physica C-superconductivity and Its Applications Pub Date : 2025-04-17 DOI:10.1016/j.physc.2025.1354726

N. Haberkorn , Yong Seung Kwon

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引用次数: 0

摘要

本文对（Ca0.85La0.15）10(Pt3As8)(Fe2As2)5单晶的涡旋动力学进行了全面的研究，并通过磁化测量进行了表征。在超导临界温度为32 K时，该材料具有显著的各向异性（5-6），这显著影响了本征涡波动。我们的研究结果显示，在1.8 K和低磁场下，临界电流密度较低，即Jc ~ 0.6 MA/cm2。Jc对磁场的依赖表现为鱼尾或第二峰，这一特征通常与弱涡旋钉住和涡旋松弛交叉有关。此外，在低磁场和低温度下，磁通蠕变速率特别大。通过Maley的分析，我们提取了低涡旋钉住能量（~ 50 K）和玻璃状指数，这些指数与单涡旋钉住的预期一致，逐渐向涡旋束演变。这些发现增强了我们对铁基超导体涡旋动力学的理解，突出了涡旋相图中本征涡旋波动的关键作用。

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Glassy relaxation and weak vortex pinning in anisotropic (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 single crystals

We present a comprehensive study on the vortex dynamics of (Ca_0.85La_0.15)₁₀(Pt₃As₈)(Fe₂As₂)₅ single crystals, characterized by magnetization measurements. With a superconducting critical temperature of 32 K, this material is notable for its substantial anisotropy (5–6), which significantly influences the intrinsic vortex fluctuations. Our results reveal low critical current densities, i. e. J_c∼0.6 MA/cm² at 1.8 K and low magnetic fields. The magnetic field dependences of J_c exhibit a fishtail or second peak in the magnetization, a feature commonly associated with weak vortex pinning and vortex relaxation crossovers. Moreover, the flux creep rates are exceptionally large at low fields and temperatures. Through Maley’s analysis, we extract low vortex pinning energies (∼50 K) and glassy exponents that are consistent with expectations for single-vortex pinning, progressively evolving towards vortex bundles. These findings enhance our understanding of vortex dynamics in iron-based superconductors, highlighting the key role of intrinsic vortex fluctuations in the vortex phase diagram.

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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.