Unusual Nernst effect and spin density wave precursors in superconducting LaFeAsO1−xFx
Agnieszka Kondrat, Günter Behr, Bernd Büchner, Christian Hess
DOI 10.1103/PhysRevB.83.092507 · Physical Review B
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Abstract
The Nernst effect has recently been 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 LaFeAsO1−xFx 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≲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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO0.95F0.05 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20.6 | Pressure not reported | unknown |
| LaFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26.8 | Pressure not reported | unknown |
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