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The Nernst effect has recently proven as a sensitive probe for detectingunusual normal state properties of unconventional superconductors. Here wepresent a systematic study of the Nernst effect of the iron pnictidesuperconductor \laf with a particular focus on its evolution upon doping. Forthe parent compound we observe a huge negative Nernst coefficient accompaniedwith a severe violation of the Sondheimer cancellation in the spin density wave(SDW) ordered state. Surprisingly, an unusual and enhanced Nernst signal isalso found at underdoping ($x=0.05$) despite the presence of bulksuperconductivity and the absence of static magnetic order, strongly suggestiveof SDW precursors at $T\lesssim150$ K. A more conventional normal state Nernstresponse is observed at optimal doping ($x=0.1$) where it is rather featurelesswith a more complete Sondheimer cancellation.

Unusual Nernst effect and spin density wave precursors in superconducting $\rm\bf LaFeAsO_{1-x}F_x$