Physics – Condensed Matter – Superconductivity
Scientific paper
2008-07-25
Angew. Chem. Int. Ed. 2008, 47, 7949-7952
Physics
Condensed Matter
Superconductivity
4 pages, 6 figures, text revised, one figure added, accepted for publication in Angew. Chem. Int. Ed
Scientific paper
10.1002/anie.200803641
We report on doping dependencies of structural parameters and superconducting transition temperatures in the solid solution (Ba1-xKx)Fe2As2. As the main effect of doping on the crystal structure, we find linear decreasing As-Fe-As bond angles and Fe-Fe distances, equivalent to an elongation of the FeAs4 tetrahedra along [001]. The structural changes are intimately coupled to the electronic states at the Fermi level, because the most relevant Fe-3dx2-y2 orbitals are strongly affected by the As-Fe-As bond angle. Superconductivity is present over the whole doping range in (Ba1-xKx)Fe2As2 with a maximum Tc of 38 K at x ~ 0.4. The superconducting transitions in the orthorhombic compounds (Ba0.9K0.1)Fe2As2 (Tc ~ 3 K) and (Ba0.8K0.2)Fe2As2 (Tc ~ 25 K) is strong evidence for the coexistence of superconductivity with the structurally distorted and potentially magnetically ordered state in the BaFe2As2 family of iron arsenide superconductors.
Johrendt Dirk
Pangerl Michael
Rotter Marianne
Tegel Marcus
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