The synthesis and properties of LiFeAs, a high- Tc Fe-based superconducting stoichiometric compound, are reported. Single crystal x-ray studies reveal that it crystallizes in the tetragonal PbFCl type (P4/nmm) with a=3.7914 (7) Å and c=6.364 (2) Å. Unlike the known isoelectronic undoped intrinsic FeAs compounds, LiFeAs does not show any spin-density wave behavior but exhibits superconductivity at ambient pressures without chemical doping. It exhibits a respectable transition temperature of Tc =18 K with electronlike carriers and a very high critical field, Hc2 (0) >80 T. LiFeAs appears to be the chemical equivalent of the infinite layered compound of the high- Tc cuprates.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2008 Aug 18|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics