期刊
NATURE MATERIALS
卷 7, 期 12, 页码 953-959出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nmat2315
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资金
- US National Science Foundation [DMR-0756568]
- US Department of Energy, Division of Materials Science, Basic Energy Sciences [DOE DE-FG02-05ER46202]
- US Department of Energy, Division of Scientific User Facilities, Basic Energy Sciences
- National Science Foundation of China
- Chinese Academy of Sciences ITSNEM
- Ministry of Science and Technology of China
- Division Of Materials Research [0756568] Funding Source: National Science Foundation
Recently, high-transition-temperature (high-T-c) superconductivity was discovered in the iron pnictide RFeAsO1-xFx (R, rare-earth metal) family of materials. We use neutron scattering to study the structural and magnetic phase transitions in CeFeAsO1-xFx as the system is tuned from a semimetal to a high-T-c superconductor through fluorine (F) doping, x. In the undoped state, CeFeAsO develops a structural lattice distortion followed by a collinear antiferromagnetic order with decreasing temperature. With increasing fluorine doping, the structural phase transition decreases gradually and vanishes within the superconductivity dome near x D 0 : 10, whereas the antiferromagnetic order is suppressed before the appearance of superconductivity for x > 0.06, resulting in an electronic phase diagram remarkably similar to that of the high-T-c copper oxides. Comparison of the structural evolution of CeFeAsO1-xFx with other Fe-based superconductors suggests that the structural perfection of the Fe-As tetrahedron is important for the high-T-c superconductivity in these Fe pnictides.
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