Crystallographic Phase Transition and High-Tc Superconductivity in LaFeAsO:F

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dc.creatorNomura, Takatoshi
dc.creatorKim, Sung Wng
dc.creatorKamihara, Yoichi
dc.creatorHirano, Masahiro
dc.creatorSushko, Peter V.
dc.creatorKato, Kenichi
dc.creatorTakata, Masaki
dc.creatorShluger, Alexander L.
dc.creatorHosono, Hideo
dc.date2008-04-22
dc.date2008-11-12
dc.date.accessioned2026-07-07T10:19:36Z
dc.date.available2026-07-07T10:19:36Z
dc.descriptionUndoped LaFeAsO, parent compound of the newly found high-Tc superconductor, exhibits a sharp decrease in the temperature-dependent resistivity at ~160 K. The anomaly can be suppressed by F doping and the superconductivity appears correspondingly, suggesting a close associate of the anomaly with the superconductivity. We examined the crystal structures, magnetic properties and superconductivity of undoped (normal conductor) and 14 at.% F-doped LaFeAsO (Tc = 20 K) by synchrotron X-ray diffraction, DC magnetic measurements, and ab initio calculations to demonstrate that the anomaly is associated with a phase transition from tetragonal (P4/nmm) to orthorhombic (Cmma) phases at ~160 K as well as an antiferromagnetic transition at ~140 K. These transitions can be explained by spin configuration-dependent potential energy surfaces derived from the ab initio calculations. The suppression of the transitions is ascribed to interrelated effects of geometric and electronic structural changes due to doping by F- ions.
dc.description22 pages, 8 figures, 2 tables, Supplementary information is included at the end of the document, accepted for publication in Supercond. Sci. Technol
dc.identifierhttps://arxiv.org/abs/0804.3569
dc.identifierhttp://arxiv.org/abs/0804.3569
dc.identifierSupercond. Sci. Technol. 21 (2008) 125028
dc.identifierdoi:10.1088/0953-2048/21/12/125028
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/174570
dc.subjectSuperconductivity
dc.titleCrystallographic Phase Transition and High-Tc Superconductivity in LaFeAsO:F
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