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First-principles calculations for anisotropy of iron-based superconductors

Nakamura, Hiroki  ; Machida, Masahiko  ; Koyama, Tomio*; Hamada, Noriaki*

We perform first-principles calculations for anisotropy of various iron-based superconductors. The anisotropy ratio $$gamma$$$$_{lambda}$$ of the $$c$$-axis penetration depth to the $$ab$$-plane one is relatively small in BaFe$$_2$$As$$_2$$, LiFeAs and FeSe, indicating that the transport applications are promising in these superconductors. On the other hand, in those having perovskite type blocking layers such as Sr$$_2$$ScFePO$$_3$$ we find a very large value, $$gamma$$$$_{lambda}$$ $$_sim^{>}$$ 200, comparable to that in strongly anisotropic high-$$T$$$$_c$$ cuprate Bi$$_2$$Sr$$_2$$CaCu$$_2$$O$$_{8-delta}$$. 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. We also examine the doping effect on the anisotropy of LaFeAsO.



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Category:Physics, Applied



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