The intrinsic electronic phase diagram of iron-oxypnictide superconductors

Reference:

Hess, C., Kondrat, A., Narduzzo, A., Hamann-Borrero, J. E., Klingeler, R., Werner, J., Behr, G. and Büchner, B., 2009. The intrinsic electronic phase diagram of iron-oxypnictide superconductors. EPL (Europhysics Letters), 87 (1), 17005.

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Official URL:

http://dx.doi.org/10.1209/0295-5075/87/17005

Abstract

We present the first comprehensive derivation of the intrinsic electronic phase diagram of the iron-oxypnictide superconductors in the normal state based on the analysis of the electrical resistivity ρ of both LaFeAsO1- xFx and SmF eAsO1- xFx for a wide range of doping. Our data give clear-cut evidence for unusual normal-state properties in these new materials. In particular, the emergence of superconductivity at low doping levels is accompanied by distinct anomalous transport behavior in ρ of the normal state which is reminiscent of the spin-density wave (SDW) signature in the parent material. At higher doping levels ρ of LaFeAsO1- xFx shows a clear transition from this pseudogap-like behavior to Fermi-liquid–like behavior, mimicking the phase diagram of the cuprates. Moreover, our data reveal a correlation between the strength of the anomalous features and the stability of the superconducting phase. The pseudogap-like features become stronger in SmF eAsO1- xFx where superconductivity is enhanced and vanish when superconductivity is reduced in the doping region with Fermi-liquid–like behavior.

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