First-Principles Study for the Anisotropy of Iron-Based Superconductors toward Power and Device Applications

概要

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Performing the first-principles calculations, we investigate the anisotropy in the superconducting state of iron-based superconductors to gain an insight into their potential applications. The anisotropy ratio $\gamma_{\lambda}$ of the $c$-axis penetration depth to the $ab$-plane one is relatively small in BaFe2As2 and LiFeAs, i.e., $\gamma_{\lambda}\sim 3$, indicating that the transport applications are promising in these superconductors. On the other hand, in those having perovskite type blocking layers such as Sr2ScFePO3 we find a very large value, $\gamma_{\lambda}\gtrsim 200$, comparable to that in strongly anisotropic high-$T_{\text{c}}$ cuprate Bi2Sr2CaCu2O8-δ. Thus, the intrinsic Josephson junction stacks are expected to be formed along the $c$-axis, and novel Josephson effects due to the multi-gap nature are also suggested in these superconductors.
Physical Society of Japanの論文
2009-12-15