High current superconductivity in FeSe0.5Te0.5-coated conductors at 30 tesla

Weidong Si (), Su Jung Han, Xiaoya Shi, Steven N. Ehrlich, J Jaroszynski, Amit Goyal and Qiang Li ()
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Weidong Si: Brookhaven National Laboratory
Su Jung Han: Brookhaven National Laboratory
Xiaoya Shi: Brookhaven National Laboratory
Steven N. Ehrlich: National Synchrotron Light Source, Brookhaven National Laboratory
J Jaroszynski: National High Magnetic Field National Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, USA
Amit Goyal: Oak Ridge National Laboratory
Qiang Li: Brookhaven National Laboratory

Nature Communications, 2013, vol. 4, issue 1, 1-5

Abstract: Abstract Although high-temperature superconductor cuprates have been discovered for more than 25 years, superconductors for high-field application are still based on low-temperature superconductors, such as Nb3Sn. The high anisotropies, brittle textures and high manufacturing costs limit the applicability of the cuprates. Here we demonstrate that the iron superconductors, without most of the drawbacks of the cuprates, have a superior high-field performance over low-temperature superconductors at 4.2 K. With a CeO2 buffer, critical current densities >106 A cm−2 were observed in iron-chalcogenide FeSe0.5Te0.5 films grown on single-crystalline and coated conductor substrates. These films are capable of carrying critical current densities exceeding 105 A cm−2 under 30 tesla magnetic fields, which are much higher than those of low-temperature superconductors. High critical current densities, low magnetic field anisotropies and relatively strong grain coupling make iron-chalcogenide-coated conductors particularly attractive for high-field applications at liquid helium temperatures.

Date: 2013
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DOI: 10.1038/ncomms2337

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