Significant enhancement of upper critical fields by doping and strain in Fe-based superconductors

Details Significant enhancement of upper critical fields by doping and strain in Fe-based superconductors Significant enhancement of upper critical fields by doping and strain in Fe-based superconductors

2011-08-25

arxiv.org/abs/1108.5194v2

Physical Review B 84, 184522 (2011)

Physics

Condensed Matter

Superconductivity

Accepted for publication in Physical Review B

Scientific paper

10.1103/PhysRevB.84.184522

We report measurements of Hc2(T) up to 85 Tesla on Ba1-xKxAs2Fe2 single crystals and FeSe1-xTex films tuned by doping and strain. We observed an Hc2 enhancement by nearly 25 T at 30 K for the optimally-doped Ba1-xKxAs2Fe2 as compared to the previous results and extraordinarily high slopes dHc2/dT = 250-500 T/K near Tc in FeSe1-xTex indicating an almost complete suppression of the orbital pair-breaking. Theoretical analysis of Hc2(T) in FeSe1-xTex and the optimally doped Ba1-xKxAs2Fe2 predicts an inhomogeneous Fulde-Ferrel-Larkin-Ovchinnikov state for H//ab and T < 3-10 K, and shows that Hc2 in multiband Fe based superconductor can be enhanced by doping and strain much more effectively than by the conventional way of increasing disorder.

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