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25 April 2024

» arxiv » 1108.5194

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Significant enhancement of upper critical fields by doping and strain in Fe-based superconductors
C. Tarantini ; A. Gurevich ; J. Jaroszynski ; F. Balakirev ; E. Bellingeri ; I. Pallecchi ; C. Ferdeghini ; B. Shen ; H.H. Wen ; D. C. Larbalestier ;
Date:	25 Aug 2011
Abstract:	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.
Source:	arXiv, 1108.5194
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