Low-temperature lattice structure anomaly in the LaFeAsO0.93F0.07 superconductor by x-ray absorption spectroscopy: Evidence for a strong electron-phonon interaction

C. J. Zhang; H. Oyanagi; Z. H. Sun; Y. Kamihara; H. Hosono

doi:10.1103/PhysRevB.78.214513

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Low-temperature lattice structure anomaly in the LaFeAsO0.93F0.07 superconductor by x-ray absorption spectroscopy: Evidence for a strong electron-phonon interaction

C. J. Zhang, H. Oyanagi, Z. H. Sun, Y. Kamihara, H. Hosono

DOI 10.1103/PhysRevB.78.214513 · Physical Review B

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Abstract

The local lattice structure in LaFeAsO1−xFx superconductors is studied by extended x-ray absorption fine-structure measurements. An anomalous upturn of the mean-square relative displacement of the Fe-As bond is detected below ∼70 K as electron carriers are introduced, reflecting the occurrence of Fe-As bond local lattice fluctuation. Similar to that in cuprates, this lattice fluctuation exhibits an abrupt depression at the onset superconducting transition temperature. The results indicate that strong electron-lattice interaction is involved in the superconducting transition in oxypcnictide superconductors, putting a strict limitation on possible theoretical models.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaFeAsO0.93F0.07 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	29	Pressure not reported	onset
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	onset