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2 Jul 2012

Volume 101, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 101, 013701 (2012); http://dx.doi.org/10.1063/1.4730945 (5 pages)

Frederick Gertz, Rustam Azimov, and Alexander Khitun
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High, magnetic field independent critical currents in (Ba,K)Fe2As2 crystals

L. Fang, Y. Jia, C. Chaparro, G. Sheet, H. Claus, M. A. Kirk, A. E. Koshelev, U. Welp, G. W. Crabtree, W. K. Kwok, S. Zhu, H. F. Hu, J. M. Zuo, H.-H. Wen, and B. Shen

Appl. Phys. Lett. 101, 012601 (2012); http://dx.doi.org/10.1063/1.4731204 (5 pages) | Cited 2 times

Online Publication Date: 2 July 2012

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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.
Show PACS
74.25.Sv Critical currents
74.25.Wx Vortex pinning (includes mechanisms and flux creep)
74.62.-c Transition temperature variations, phase diagrams
74.70.Xa Pnictides and chalcogenides
74.25.F- Transport properties
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