LiFeAs: An intrinsic FeAs-based superconductor with Tc=18 K

By J. Tapp, Zhongjia Tang, B. Lv, K. Sasmal, B. Lorenz, P. Chu, A. Guloy. 2008

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The synthesis and properties of LiFeAs, a high-${T}_{c}$ Fe-based superconducting stoichiometric compound, are reported. Single crystal x-ray studies reveal that it crystallizes in the tetragonal PbFCl type (P4/nmm) with $a=3.7914(7)\text{ }\text{\AA{}}$ and $c=6.364(2)\text{ }\text{\AA{}}$. 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 ${T}_{c}=18\text{ }\text{K}$ with electronlike carriers and a very high critical field, ${\text{H}}_{c2}(0)g80\text{ }\text{T}$. LiFeAs appears to be the chemical equivalent of the infinite layered compound of the high-${T}_{c}$ cuprates.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Inorganic Chemistry

View Paper: https://www.semanticscholar.org/paper/778f82349e9cb604507316e297b771ad85f300c4