Single-crystal growth and extremely high H_c2 of 12442-type Fe-based superconductor KCa_2Fe_4As_4F_2

Millimeter sized single crystals of KCa_2Fe_4As_4F_2 were grown using a self-flux method. The chemical compositions and crystal structure were characterized carefully. Superconductivity with the critical transition T_c = 33.5 K was confirmed by both the resistivity and magnetic susceptibility measur...

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Bibliographic Details
Published in:arXiv.org 2019-03
Main Authors: Wang, Teng, Chu, Jianan, Jin, Hua, Feng, Jiaxin, Wang, Lingling, Song, Yekai, Zhang, Chi, Li, Wei, Li, Zhuojun, Hu, Tao, Jiang, Da, Peng, Wei, Liu, Xiaosong, Mu, Gang
Format: Article
Language:English
Subjects:
Chemical composition
Critical field (superconductivity)
Crystal growth
Crystal structure
Crystals
Electrical resistivity
Magnetic permeability
Organic chemistry
Physical properties
Single crystals
Superconductivity
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Summary:Millimeter sized single crystals of KCa_2Fe_4As_4F_2 were grown using a self-flux method. The chemical compositions and crystal structure were characterized carefully. Superconductivity with the critical transition T_c = 33.5 K was confirmed by both the resistivity and magnetic susceptibility measurements. Moreover, the upper critical field H_c2 was studied by the resistivity measurements under different magnetic fields. A rather steep increase for the in-plane H_c2^ab with cooling, d\mu_0H_c2^a/dT|T_c = -50.9 T/K, was observed, indicating an extremely high upper critical field. Possible origins for this behavior were discussed. The findings in our work is a great promotion both for understanding the physical properties and applications of 12442-type Fe-based superconductors.
ISSN:2331-8422
DOI:10.48550/arxiv.1903.04822