High, magnetic field independent critical currents in (Ba,K)Fe2As2 crystals

Each discovery of a new high temperature superconductor drives the expectation that advanced engineering of materials defect structures will enable effective vortex pinning and high values of the electrical current density. Here, we demonstrate that single crystals of the iron-based superconductor B...

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Bibliographic Details
Published in:Applied physics letters 2012-07, Vol.101 (1)
Main Authors: Fang, L., Jia, Y., Chaparro, C., Sheet, G., Claus, H., Kirk, M. A., Koshelev, A. E., Welp, U., Crabtree, G. W., Kwok, W. K., Zhu, S., Hu, H. F., Zuo, J. M., Wen, H.-H., Shen, B.
Format: Article
Language:English
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Summary:Each discovery of a new high temperature superconductor drives the expectation that advanced engineering of materials defect structures will enable effective vortex pinning and high values of the electrical current density. Here, we demonstrate that single crystals of the iron-based superconductor Ba0.6K0.4Fe2As2 with Tc = 37.5 K can accommodate an unprecedented large concentration of strong-pinning defects in the form of discontinuous nm-sized nanorods with no degradation of the superconducting transition temperature. At a temperature of 5 K, we find a critical current density of 5 MA/cm2 that is magnetic field independent in fields up to 7 T.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4731204