Superconducting Fe-Based Compounds(A1−xSrx)Fe2As2withA=Kand Cs with Transition Temperatures up to 37 K

2008/06/30 by Kalyan Sasmal, K. Sasmal, B. Lv +10 · 1 citation
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Corporate Taxation and Avoidance #Iron-based superconductors research #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.101.107007

published as Phys. Rev. Lett. 101, 107007 (2008) · minor corrections, references completed, figures revised

openalex publication_date 2008/09/05 · arxiv created 2008/09/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

New high-T_c Fe-based superconducting compounds, AFe₂As₂ with A=K, Cs, K/Sr, and Cs/Sr, were synthesized. The T_c 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 T_c.

Citations

• Two-band superconductivity in LaFeAsO0.89F0.11 at very high magnetic fields
• Superconductivity at 52 K in iron based F doped layered quaternary compound Pr[O1–xFx]FeAs

Cited by

• Physical properties of EuPd2As2single crystals