Physics – Condensed Matter – Superconductivity
Scientific paper
2010-11-19
Phys. Rev. B, vol. 83, 054511, 2011
Physics
Condensed Matter
Superconductivity
6 pages, 5 figures, 1 table
Scientific paper
10.1103/PhysRevB.83.054511
We report a systematic study on the influence of antiferromagnetic and ferromagnetic phases of Eu^2+ moments on the superconducting phase upon doping the As site by isovalent P, which acts as chemical pressure on EuFe_2As_2. Bulk superconductivity with transition temperatures of 22 K and 28 K are observed for x=0.16 and 0.20 samples respectively. The Eu ions order antiferromagnetically for x<=0.13, while a crossover is observed for x>=0.22 whereupon the Eu ions order ferromagnetically. Density functional theory based calculations reproduce the observed experimental findings consistently. We discuss in detail the coexistence of superconductivity and magnetism in a tiny region of the phase space and comment on the competition of ferromagnetism and superconductivity in the title compound.
Gegenwart Philip
Jeevan Hirale S.
Kasinathan Deepa
Rosner Helge
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