Unusual Nernst effect and spin density wave precursors in superconducting $\mathbf{LaFeAs}{\mathbf{O}}_{1-\mathbf{x}}{\mathbf{F}}_{\mathbf{x}}$

Abstract

The Nernst effect has recently proven as a sensitive probe for detecting unusual normal state properties of unconventional superconductors. Here we present a systematic study of the Nernst effect of the iron pnictide superconductor \laf with a particular focus on its evolution upon doping. For the parent compound we observe a huge negative Nernst coefficient accompanied with a severe violation of the Sondheimer cancellation in the spin density wave (SDW) ordered state. Surprisingly, an unusual and enhanced Nernst signal is also found at underdoping ($x=0.05$) despite the presence of bulk superconductivity and the absence of static magnetic order, strongly suggestive of SDW precursors at $T\lesssim 150$ K. A more conventional normal state Nernst response is observed at optimal doping ($x=0.1$) where it is rather featureless with a more complete Sondheimer cancellation.

4 pages, 3 figures

References in corpus (13)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• The electronic phase diagram of the LaO1-xFxFeAs superconductor
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Evolution from Itinerant Antiferromagnet to Unconventional Superconductor with Fluorine Doping in La(O_{1-x}F_{x})FeAs Revealed by ^{75}As and ^{139}La Nuclear Magnetic Resonance
• Coexistence of static magnetism and superconductivity in SmFeAsO1-xFx as revealed by muon spin rotation
• Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study
• Competing order and nature of the pairing state in the iron pnictides
• The Nernst effect and the boundaries of the Fermi liquid picture
• Enhancement of the Nernst effect by stripe order in a high-Tc superconductor
• Nanoscale electronic order in iron pnictides
• Normal State Nernst Effect in Electron-doped Pr2-xCexCuO4: Superconducting Fluctuations and Two-band Transport
• Nernst effect of the new iron-based superconductor LaO${}_{1-x}$F${}_x$FeAs
• Nernst Effect of stripe ordering La${}_{1.8-x}$Eu${}_{0.2}$Sr${}_x$CuO${}_4$

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