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Superconductivity at 38 K in the Iron Arsenide (Ba1xKx)Fe2As2

Marianne Rotter, Marcus Tegel, and Dirk Johrendt
Phys. Rev. Lett. 101, 107006 – Published 5 September 2008

Abstract

The ternary iron arsenide BaFe2As2 becomes superconducting by hole doping, which was achieved by partial substitution of the barium site with potassium. We have discovered bulk superconductivity at Tc=38K in (Ba1xKx)Fe2As2 with x0.4. The parent compound BaFe2As2 crystallizes in the tetragonal ThCr2Si2-type structure, which consists of (FeAs)δ iron arsenide layers separated by Ba2+ ions. BaFe2As2 is a poor metal and exhibits a spin density wave anomaly at 140 K. By substituting Ba2+ for K+ ions we have introduced holes in the (FeAs) layers, which suppress the anomaly and induce superconductivity. The Tc of 38 K in (Ba0.6K0.4)Fe2As2 is the highest in hole doped iron arsenide superconductors so far. Therefore, we were able to expand this class of superconductors by oxygen-free compounds with the ThCr2Si2-type structure.

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  • Received 29 May 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.107006

©2008 American Physical Society

Authors & Affiliations

Marianne Rotter, Marcus Tegel, and Dirk Johrendt*

  • Department Chemie und Biochemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13 (Haus D), 81377 München, Germany

  • *johrendt@lmu.de

See Also

Superconducting Fe-Based Compounds (A1xSrx)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, and Ching-Wu Chu
Phys. Rev. Lett. 101, 107007 (2008)

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Issue

Vol. 101, Iss. 10 — 5 September 2008

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