Superconducting fe-based compounds (A1-xSrx)Fe2As2 with A=K and Cs with transition temperatures up to 37 K

Kalyan Sasmal, Bing Lv, Bernd Lorenz, Arnold M. Guloy, Feng Chen, Yu Yi Xue, Ching Wu Chu

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622 Citations (Scopus)

Abstract

New high-Tc Fe-based superconducting compounds, AFe2As2 with A=K, Cs, K/Sr, and Cs/Sr, were synthesized. The Tc of KFe2As2 and CsFe2As2 is 3.8 and 2.6 K, respectively, which rises with partial substitution of Sr for K and Cs and peaks at 37 K for 50%-60% Sr substitution, and the compounds enter a spin-density-wave state with increasing electron number (Sr content). The compounds represent p-type analogs of the n-doped rare-earth oxypnictide superconductors. Their electronic and structural behavior demonstrate the crucial role of the (Fe2As2) layers in the superconductivity of the Fe-based layered systems, and the special feature of having elemental A layers provides new avenues to superconductivity at higher Tc.

Original languageEnglish
Article number107007
JournalPhysical review letters
Volume101
Issue number10
DOIs
Publication statusPublished - 2008 Sep 5

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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