Giant magnetic flux jumps in single crystals of Ba0.6 K 0.4 Fe2 As2

Ki Young Choi, Gun Sang Jeon, X. F. Wang, X. H. Chen, Xiao Lin Wang, Myung Hwa Jung, Sung Ik Lee, Gangseo Park

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Giant magnetic flux jumps are observed in magnetic hysteresis loops of Ba0.6 K0.4 Fe2 As2 single crystals. The size of the flux jumps, which appear only at low temperatures (T<4 K), is so large that it can transform the whole superconducting state into the normal state. The recovery rate to the superconducting state is rather slow, although the superconducting state is almost fully recovered. We show that theoretical predictions based on the adiabatic approach with nonlocal electrodynamics give a good explanation of the flux jumps observed in the single crystals of Ba 0.6 K0.4 Fe2 As2.

Original languageEnglish
Article number182505
JournalApplied Physics Letters
Issue number18
StatePublished - 2 May 2011

Bibliographical note

Funding Information:
We gratefully acknowledge helpful discussions with Kee Hoon Kim. This work was supported by the National Creative Research Initiative (Grant No. 2010-0018300) and the Special Fund of Sogang University. We thank the A3 foreign program for initiating this project. This work is also supported in part by the Ministry of Education, Science and Technology/National Research Foundation (MEST/NRF) of Korea (Grant No. 2010-0010937) and the Australian Research Council through Discovery projects (Grant Nos. DP0558753 and DP1094037).


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