Ex) Article Title, Author, Keywords
J. Korean Phy. Soc. 2018; 72(4): 515-521
Published online February 28, 2018 https://doi.org/10.3938/jkps.72.515
Copyright © The Korean Physical Society.
Soon-Gil Jung1, Harim Jang1, Soohyeon Shin1, Tuson Park1
1Center for Quantum Materials and Superconductivity (CQMS) and Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
Correspondence to:Tuson Park
Origin of the multiple superconducting transitions and high Tc phase in rare-earth-doped CaFe2As2 superconductors is still under debate. Critical current density (Jc) of La-doped CaFe2As2 (LaCa122) suggests that the low-Tc phase exists globally, while the high-Tc phase is locally distributed within small domains of crystals. LaCa122-A (LaCa122-B) is a crystal that shows the two-step (one-step) superconducting transitions in resistivity, where Jc1 and Jc2 result from the low-Tc and high-Tc phases, respectively. These results indicate that the two-step superconducting transitions in the rare-earth-doped CaFe2As2 are related with connectivity among the domains of high-Tc phases that are nucleated around La dopants.
Keywords: La-doped CaFe2As2, Transport critical current density, Two-step superconducting transitions
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