Abstract
The recently discovered oxypnictide superconductor SmFeAs(O,F) is the most attractive material among the Fe-based superconductors due to its highest transition temperature of 56 K and potential for high-field performance. In order to exploit this new material for superconducting applications, the knowledge and understanding of its electro-magnetic properties are needed. Recent success in fabricating epitaxial SmFeAs(O,F) thin films opens a great opportunity to explore their transport properties. Here we report on a high critical current density of over 105 A/cm2 at 45 T and 4.2 K for both main field orientations, feature favourable for high-field magnet applications. Additionally, by investigating the pinning properties, we observed a dimensional crossover between the superconducting coherence length and the FeAs interlayer distance at 30–40 K, indicative of a possible intrinsic Josephson junction in SmFeAs(O,F) at low temperatures that can be employed in electronics applications such as a terahertz radiation source and a superconducting Qubit.
Highlights
The recently discovered oxypnictide superconductor SmFeAs(O,F) is the most attractive material among the Fe-based superconductors due to its highest transition temperature of 56 K and potential for high-field performance
By investigating the pinning properties, we observed a dimensional crossover between the superconducting coherence length and the FeAs interlayer distance at 30–40 K, indicative of a possible intrinsic Josephson junction in SmFeAs(O,F) at low temperatures that can be employed in electronics applications such as a terahertz radiation source and a superconducting Qubit
We report on various in – plane transport properties up to 45 T of epitaxial SmFeAs(O,F) thin films grown by molecular beam epitaxy (MBE) on CaF2 (001) single www.nature.com/scientificreports crystalline substrates and discuss their pinning properties
Summary
The recently discovered oxypnictide superconductor SmFeAs(O,F) is the most attractive material among the Fe-based superconductors due to its highest transition temperature of 56 K and potential for high-field performance. A mong the recently discovered Fe-based superconductors[1], the highest superconducting transition temperature Tc of 56 K has been reported in SmFeAs(O,F)[2] This new class of material shows very high upper critical fields at low temperatures together with a moderate anisotropy ranging from 4 to 73, which is suitable for high-field magnet applications. High performance K-doped Ba-122 and Sr-122 wires by PIT have been reported by Weiss et al.[15] and Gao et al[16], respectively These results are very promising for realising Fe-based superconducting high-field applications. In situ prepared LnFeAs(O,F) (Ln 5 Nd and Sm) epitaxial thin films with Tc exceeding 50 K have been realised by molecular beam epitaxy (MBE)[17,18] These successes give many possibilities to explore electro-magnetic properties. This indicates the possible intrinsic Josephson junction in SmFeAs(O,F)
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