Physics – Condensed Matter – Superconductivity
Scientific paper
2008-11-20
Phys. Rev. B 78, 214513 (2008)
Physics
Condensed Matter
Superconductivity
15 pages, 6 figures
Scientific paper
10.1103/PhysRevB.78.214513
The local lattice structure in newly discovered 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.
Hosono Hideo
Kamihara Yoichi
Oyanagi H.
Sun Zhi-Hong
Zhang Cheng-Jun
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