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Superconductivity in LaFeAs$_{1-x}$P$_{x}$O: effect of chemical pressures and bond covalency

Authors :
Guanghan Cao
Chunmu Feng
Shuai Jiang
Zhu-An Xu
Qian Tao
Linjun Li
Cao Wang
Zhi Ren
Yuke Li
Jianhui Dai
Publication Year :
2008

Abstract

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 Fe$_2$As$_2$ layers are squeezed while the La$_2$O$_2$ layers are stretched along the c-axis. Electrical resistance and magnetization measurements show emergence of bulk superconductivity at $\sim$10 K for the optimally-doped LaFeAs$_{1-x}$P$_{x}$O ($x=0.25\sim0.3$). The upper critical fields 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.<br />5 pages, 6 figures, more data presented

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....f005c8c8c60cfb261b4bdf0d821f425c