Physics – Condensed Matter – Superconductivity
Scientific paper
2010-04-17
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY Volume: 53 Issue: 7 Pages: 1225-1229 Published: JUL 2010
Physics
Condensed Matter
Superconductivity
7 pages, 4 figures, 1 table. to be published in Science in China Series G
Scientific paper
10.1007/s11433-010-0197-8
We report the antimony (Sb) doping effect in a prototype system of iron-based supercon-ductors LaFeAsO1-yFy (y=0, 0.1, 0.15). X-ray powder diffraction indicates that the lattice pa-rameters increase with Sb content within the doping limit. Rietveld structural refinements show that, with the partial substitution of Sb for As, while the thickness of the Fe2As2 layers increases significantly, that of the La2O2 layers shrinks simultaneously. So a negative chemical pressure is indeed "applied" to the superconducting-active Fe2As2 layers, in con-trast to the effect of positive chemical pressure by the phosphorus doping. Electrical resis-tance and magnetic susceptibility measurements indicate that, while the Sb doping hardly influences the SDW anomaly in LaFeAsO, it recovers SDW order for the optimally-doped sample of y=0.1. In the meantime, the superconducting transition temperature can be raised up to 30 K in LaFeAs1-xSbxO1-yFy with x=0.1 and y=0.15. The Sb doping effects are discussed in term of both J1-J2 model and Fermi Surface (FS) nesting scenario.
Cao Guang-han
Jiang Shuai
Li Yu-ke
Ma Zhifeng
Wang Cao
No associations
LandOfFree
Structural and superconducting properties in LaFeAs1-xSbxO1-yFy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Structural and superconducting properties in LaFeAs1-xSbxO1-yFy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structural and superconducting properties in LaFeAs1-xSbxO1-yFy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-69554