Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524
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Article

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.

Critical Current Density in the Heterogeneous High-Tc Superconductor Ca1-xLaxFe2As2

Soon-Gil Jung1, Harim Jang1, Soohyeon Shin1, Tuson Park1

Won Nam Kang2

1Center for Quantum Materials and Superconductivity (CQMS) and Department of Physics, Sungkyunkwan University, Suwon 16419, Korea

2Department of Physics, Sungkyunkwan University, Suwon 16419, Korea

Correspondence to:Tuson Park

Abstract

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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