Superconductivity in LaFeAsPxO: Effect of chemical pressures and bond covalencyCao Wang, Shuai Jiang, Qian Tao, Zhi Ren, Yuke Li, Linjun Li, Chunmu Feng, Jianhui Dai, Guanghan Cao and Zhu-an XuEPL, 86 4 (2009) 47002DOI: https://doi.org/10.1209/0295-5075/86/47002