The Synthesis and Characterization of LiFeAs and NaFeAs
C. W. Chu (1, 2, 3), F. Chen (1), M. Gooch (1), A. M. Guloy (4),, B. Lorenz (1), B. Lv (4), K. Sasmal (1), Z. J. Tang (4), J. H. Tapp (4), Y., Y. Xue (1) ((1) Department of Physics, TCSUH, University of Houston,, Houston, TX, (2) LBNL, Berkeley, CA, (3) HKUST, Hong Kong, China
TL;DR
This paper reports the synthesis and structural characterization of new superconducting LiFeAs and NaFeAs compounds, revealing their crystal structures and superconducting transition temperatures without magnetic order.
Contribution
It introduces the synthesis and detailed characterization of LiFeAs and NaFeAs, expanding the family of iron-based superconductors with new compounds and properties.
Findings
LiFeAs and NaFeAs are superconductors with T_c of ~18 K and 12-25 K
Both compounds have layered tetragonal anti-PbFCl-type structures
No magnetic order was observed in either compound
Abstract
The newest homologous series of superconducting As-pnictides, LiFeAs (Li111) and NaFeAs (Na111) have been synthesized and investigated. Both crystallize with the layered tetragonal anti-PbFCl-type structure in P4/nmm space group. Polycrystalline samples and single-crystals of Li111 and Na111 display superconducting transitions at ~ 18 K and 12-25 K, respectively. No magnetic order has been found in either compound, although a weak magnetic background is clearly in evidence. The origin of the carriers and the stoichiometric compositions of Li111 and Na111 were explored.
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