Volume 87, Number 1, July 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||23 July 2009|
The intrinsic electronic phase diagram of iron-oxypnictide superconductors
Leibniz-Institute for Solid State and Materials Research, IFW Dresden - 01171 Dresden, Germany, EU
Corresponding author: C.Hess@ifw-dresden.de
Accepted: 24 June 2009
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 LaFeAsOFx and SmFeAsOFx 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 LaFeAsOFx 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 SmFeAsOFx where superconductivity is enhanced and vanish when superconductivity is reduced in the doping region with Fermi-liquid–like behavior.
PACS: 74.25.Dw – Superconductivity phase diagrams / 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EPLA, 2009
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