| Issue |
EPL
Volume 86, Number 4, May 2009
|
|
|---|---|---|
| Article Number | 47002 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/86/47002 | |
| Published online | 26 May 2009 | |
Superconductivity in LaFeAs
PxO: Effect of chemical pressures and bond covalency
1
Department of Physics, Zhejiang University - Hangzhou 310027, China
2
Test and Analysis Center, Zhejiang University - Hangzhou 310027, China
Corresponding authors: ghcao@zju.edu.cn zhuan@zju.edu.cn
Received:
9
April
2009
Accepted:
27
April
2009
We report the realization of superconductivity by an isovalent doping with phosphorus in LaFeAsO. X-ray diffraction shows that, with the partial substitution of P for As, the Fe2As2 layers are squeezed while the La2O2 layers are stretched along the c-axis. Electrical resistance and magnetization measurements show emergence of bulk superconductivity at ~ 10 K for the optimally doped LaFeAsPxO (x = 0.25–0.3). The upper critical field at zero temperature is estimated to be 27 T, much higher than that of the LaFePO superconductor. The occurrence of superconductivity is discussed in terms of chemical pressures and bond covalency.
PACS: 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.) / 74.62.Bf – Effects of material synthesis, crystal structure, and chemical composition / 74.62.Dh – Effects of crystal defects, doping and substitution
© EPLA, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.