Abstract
We report on the growth of NdFeAs(O,F) thin films on [001]-tilt MgO bicrystal substrates with misorientation angle θGB=6°, 12°, 24° and 45°, and their inter- and intra-grain transport properties. X-ray diffraction study confirmed that all our NdFeAs(O,F) films are epitaxially grown on the MgO bicrystals. The θGB dependence of the inter-grain critical current density Jc shows that, unlike Co-doped BaFe2As2 and Fe(Se,Te), its decay with θGB is rather significant. As a possible reason of this result, fluorine may have diffused preferentially to the grain boundary region and eroded the crystal structure.
Highlights
It is very important to examine the currentlimiting effect of grain boundaries (GBs) for fabricating superconducting wires and tapes based on high critical temperature (Tc) superconductors
We report on the growth of NdFeAs(O,F) thin films on [001]–tilt MgO bicrystal substrates with misorientation angle θGB = 6◦, 12◦, 24◦ and 45◦, and their inter- and intra-grain transport properties
NdFeAs(O,F) thin films were grown on 6◦, 12◦, 24◦ and 45◦ [001]–tilt MgO bicrystal substrates and their electrical transport properties were investigated
Summary
It is very important to examine the currentlimiting effect of grain boundaries (GBs) for fabricating superconducting wires and tapes based on high critical temperature (Tc) superconductors. For practical use as superconducting tapes, biaxially textured YBCO conductors whose inplane orientation distribution is smaller than θc are required. This demands a costly fabrication process and delayed significantly conductor applications. Iron-based superconductors (FBS) form a material class that has a high Tc next to the cuprates and a high upper critical field (Hc2) exceeding 100 T with a moderate Hc2 anisotropy.[2] Regarding the grain boundary characteristics, Katase et al reported that θc is as large as 9◦ for Co-doped BaFe2As2, which is about twice larger than that of YBCO.[3] In addition, the attenuation of Jcinter above θc was more moderate than YBCO. We report on the transport properties of NdFeAs(O,F) films grown on bicrystal substrates with various misorientation angles
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