Anisotropic physical properties and large critical current density in KCa2Fe4As4F2 single crystal

arXiv: Superconductivity Pub Date : 2020-06-08 DOI:10.1103/physrevmaterials.4.104801

S. Pyon, Yuto Kobayashi, A. Takahashi, Wenjie Li, Teng Wang, G. Mu, A. Ichinose, T. Kambara, A. Yoshida, T. Tamegai

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引用次数: 5

Abstract

We present a systematic study of electrical resistivity, Hall coefficient, magneto-optical imaging, magnetization, and STEM analyses of KCa${_2}$Fe${_4}$As${_4}$F${_2}$ single crystals. Sharp diamagnetic transition and magneto-optical imaging reveal homogeneity of single crystal and prominent Bean-like penetrations of vortices. Large anisotropy of electrical resistivity, with ${\rho _c / \rho _{ab}}$ > 100, and semiconductor-like ${\rho _c}$ suggest that the electronic state is quasi two-dimensional. Hall effect measurements indicate that KCa${_2}$Fe${_4}$As${_4}$F${_2}$ is a multiband system with holes as main carriers. Magnetization measurements reveal significantly larger J$_c$ compared with that in other iron-based superconductors with different values of J$_c$ depending on the direction of magnetic field. Origin of these J$_c$ characteristics is discussed based on microstructural observations using STEM. In addition, further enhancement of J$_c$ in KCa${_2}$Fe${_4}$As${_4}$F${_2}$ for future application is demonstrated in terms of heavy-ion irradiation.

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KCa2Fe4As4F2单晶的各向异性物理特性和大临界电流密度

本文系统地研究了KCa${_2}$Fe${_4}$As${_4}$F${_2}$单晶的电阻率、霍尔系数、磁光成像、磁化和STEM分析。锐利的抗磁转变和磁光成像显示单晶均匀性和明显的豆状涡旋穿透。电阻率的大各向异性，${\rho _c / \rho _{ab}}$ > 100和半导体样${\rho _c}$表明电子态是准二维的。霍尔效应测量表明，KCa${_2}$Fe${_4}$As${_4}$F${_2}$是一个以空穴为主载流子的多波段体系。磁化测量表明，与其他铁基超导体相比，J$_c$明显更大，并且J$_c$的值随磁场方向的不同而不同。基于STEM的显微结构观察，讨论了这些J$_c$特征的来源。此外，在KCa${_2}$Fe${_4}$As${_4}$F${_2}$中进一步增强了J$_c$，为将来在重离子辐照中的应用提供了依据。

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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arXiv: Superconductivity

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