The intrinsic electronic phase diagram of iron-oxypnictide superconductors - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: We present the first comprehensive derivation of the intrinsic electronicphase diagram of the iron-oxypnictide superconductors in the normal state basedon the analysis of the electrical resistivity $ ho$ of bothLaFeAsO$ {1-x}$F$ x$ and SmFeAsO$ {1-x}$F$ x$ for a wide range of doping. Ourdata give clear-cut evidence for unusual normal state properties in these newmaterials. In particular, the emergence of superconductivity at low dopinglevels is accompanied by distinct anomalous transport behavior in $ ho$ of thenormal state which is reminiscent of the spin density wave SDW signature inthe parent material. At higher doping levels $ ho$ of LaFeAsO$ {1-x}$F$ x$shows a clear transition from this pseudogap-like behavior to Fermi liquid-likebehavior, mimicking the phase diagram of the cuprates. Moreover, our datareveal a correlation between the strength of the anomalous features and thestability of the superconducting phase. The pseudogap-like features becomestronger in SmFeAsO$ {1-x}$F$ x$ where superconductivity is enhanced and vanishwhen superconductivity is reduced in the doping region with Fermi liquid-likebehavior.



Autor: C. Hess, A. Kondrat, A. Narduzzo, J. E. Hamann-Borrero, R. Klingeler, J. Werner, G. Behr, B. Büchner

Fuente: https://arxiv.org/







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