Evidence for Strong Itinerant Spin Fluctuations in the Normal State of CeFeAsO(0.89)F(0.11) Iron-Oxypnictides

TL;DR

This study provides evidence of strong itinerant spin fluctuations in the normal state of CeFeAsO(0.89)F(0.11) iron-oxypnictides, highlighting their potential role in high-temperature superconductivity distinct from cuprates.

Contribution

It presents spectroscopic evidence of itinerant spin fluctuations in CeFeAsO(0.89)F(0.11), offering new insights into the magnetic properties related to superconductivity in iron-based materials.

Findings

Fe d-electron itinerancy confirmed

Presence of itinerant spin fluctuations detected

Distinct from cuprate superconductors' physics

Abstract

The electronic structure in the normal state of CeFeAsO0.89F0.11 oxypnictide superconductors has been investigated with x-ray absorption and photoemission spectroscopy. All the data exhibit signatures of Fe d-electron itinerancy. Exchange multiplets appearing in the Fe 3s core level indicate the presence of itinerant spin fluctuations. These findings suggest that the underlying physics and the origin of superconductivity in these materials are likely to be quite different from those of the cuprate high-temperature superconductors. These materials provide opportunities for elucidating the role of magnetic fluctuations in high-temperature superconductivity.