CaKFe$_4$As$_4$ 单晶内在超导特性的改变与外压作用下的引脚分布之间的竞争

arXiv - PHYS - Superconductivity Pub Date : 2024-09-05 DOI:arxiv-2409.03809

Shuyuan Huyan, Nestor Haberkorn, Mingyu Xu, Paul C. Canfield, Sergey L. Bud'ko

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引用次数: 0

摘要

本文介绍了在金刚石压力池中对 CaKFe$_4$As$_4$ 单晶体在高达 7.5 GPa 压力下的低场磁化、困磁和 5 Kflux 蠕变的测量结果。观察到的自场临界电流温度依赖性的演变和基温磁通蠕变速率的减慢，可以用文献中提出的涉及 CaKFe$_4$As$_4$ 间生长的两个旋流源假说来解释。在压力下的半塌陷四方结构转变以上，超导性为非大量存在或不存在，观察到二磁性和磁通陷磁化严重减弱或不存在。

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Competition between the modification of intrinsic superconducting properties and the pinning landscape under external pressure in CaKFe$_4$As$_4$ single crystals

Measurements of low field magnetization, trapped flux magnetization and 5 K flux creep in single crystal of CaKFe$_4$As$_4$ under pressure up to 7.5 GPa in a diamond pressure cell are presented. The observed evolution of the temperature dependence of the self-field critical current and slowing down of the base temperature flux creep rate are explained within the two sources of pinning hypothesis involving presence of CaKFe$_4$As$_4$ intergrowths suggested in the literature. Above the half collapsed tetragonal structural transition under pressure, where superconductivity is non-bulk or absent, critically diminished or no diamagnetism and flux trapped magnetization were observed.

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arXiv - PHYS - Superconductivity

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