Journal
PHYSICAL REVIEW B
Volume 90, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.134421
Keywords
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Funding
- MIUR-FIRB-Project HybridNanoDev [RBFR1236VV]
- EU FP7 under REA [630925-COHEAT]
- FP7 European project SUPER-IRON [283204]
- EuroMagNET II Project - European Union [228043]
- [2012X3YFZ2]
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We investigate the Seebeck effect in RFeAsO (R = rare earth) compounds as a function of temperature and magnetic field up to 30 T. The Seebeck curves are characterized by a broad negative bump around 50 K, which is sample dependent and strongly enhanced by the application of a magnetic field. A model for the temperature and field dependence of the magnon drag contribution to the Seebeck effect by antiferromagnetic (AFM) spin fluctuation is developed. It accounts for the magnitude and scaling properties of such bump feature in our experimental data in LaFeAsO. This analysis accounts for the apparent inconsistency of literature Seebeck effect data on these compounds and has the potential to extract precious information on the coupling between electrons and AFM spin fluctuations in these parent compound systems, with implications on the pairing mechanism of the related superconducting compounds.
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