Superconductivity at 38 K in the Iron Arsenide(Ba1−xKx)Fe2As2

2008/05/31 by M. Rotter, Marianne Rotter, Marcus Tegel +1 · 66 citations
Chemistry · Materials Science · Physics and Astronomy · #Arsenide #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Doping #Gallium arsenide #Ion #Iron-based superconductors research #Materials science #Physics #Quantum mechanics #Rare-earth and actinide compounds #Superconductivity #Ternary operation #Tetragonal crystal system #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.101.107006

published as Phys. Rev. Lett. 101, 107006 (2008) · 4 pages, 5 figures, submitted to Phys. Rev. Lett

arxiv created 2008/07/17 · openalex publication_date 2008/09/05 · arxiv updated 2009/12/01 · openalex created_date 2020/05/13 · openalex updated_date 2026/08/05

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 T_c=38 K in (Ba_1\ensuremath-xK_x)Fe₂As₂ with x\ensuremath≈0.4. The parent compound BaFe₂As₂ crystallizes in the tetragonal ThCr₂Si₂-type structure, which consists of (FeAs)^\ensuremathδ\ensuremath- 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)^\ensuremath- layers, which suppress the anomaly and induce superconductivity. The T_c of 38 K in (Ba_0.6K_0.4)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.

Citations

• Possible highT c superconductivity in the Ba?La?Cu?O system
• Competing orders and spin-density-wave instability in La(O 1−x F x )FeAs
• Superconductivity at 25 K in hole-doped (La 1-x Sr x )OFeAs
• Nickel-based phosphide superconductor with infinite-layer structure, BaNi2P2
• Rietveld refinement of Debye–Scherrer synchrotron X-ray data from Al2O3

Cited by

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• Spin Gap and Resonance at the Nesting Wave Vector in SuperconductingFeSe0.4Te0.6
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• Exploration of new superconductors and functional materials, and fabrication of superconducting tapes and wires of iron pnictides
• Effects of single- and multi-substituted Zn ions in doped 122-type iron-based superconductors
• Superconductivity in 122-type antimonideBaPt2Sb2
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• Filling the holes in the CaFe4As3 structure: Synthesis and magnetism of CaCo5As3
• Bulk synthesis of iron-based superconductors

Related

• Superconductivity and Crystal Structures of (Ba1−xKx)Fe2As2 (x=0–1)
• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
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• Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2
• Superconducting Fe-Based Compounds(A1−xSrx)Fe2As2withA=Kand Cs with Transition Temperatures up to 37 K