2020/06/08 by Sunseng Pyon, Yuto Kobayashi, Ayumu Takahashi +7 · 22 citations
Materials Science · Physics and Astronomy · #Anisotropy #Critical current #Diamagnetism #Hall effect #Homogeneity (statistics) #Iron-based superconductors research #Magnetization #Rare-earth and actinide compounds #Single crystal #Superconductivity #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevmaterials.4.104801
published in Physical Review Materials 4(10) (American Physical Society) · 23 pages, 10 figures
arxiv created 2020/06/08 · openalex created_date 2020/06/12 · openalex publication_date 2020/10/21 · arxiv updated 2020/10/28 · openalex updated_date 2026/08/05
We present a systematic study of electrical resistivity, Hall coefficient, magneto-optical imaging, magnetization, and scanning transmission electron microscopy (STEM) analyses of KCa2Fe4As4F2 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 \ensuremathρc/\ensuremathρab>100, and semiconductorlike \ensuremathρc suggest that the electronic state is quasi-two-dimensional. Hall effect measurements indicate that KCa2Fe4As4F2 is a multiband system with holes as main carriers. Magnetization measurements reveal significantly larger Jc compared with that in other iron-based superconductors with different values of Jc depending on the direction of magnetic field. The origin of these Jc characteristics is discussed based on microstructural observations using STEM. In addition, further enhancement of Jc in KCa2Fe4As4F2 for future high-field application is demonstrated in terms of heavy-ion irradiation.