2011/02/28 by Marcin Matusiak, Z. Bukowski, Zbigniew Bukowski +2 · 42 citations
Chemistry · Materials Science · Physics and Astronomy · #Antiferromagnetism #Chemistry #Condensed matter physics #Doping #Iron-based superconductors research #Materials science #Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.83.224505
published in Physical Review B 83(22) (American Physical Society) · 5 pages, 5 figures; ver.3: the sign convention for the Nernst coefficient is changed
arxiv created 2011/04/21 · openalex publication_date 2011/06/21 · arxiv updated 2015/03/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report a systematic study of the transport properties in the series of Eu(Fe_1\ensuremath-xCox)2As2 single crystals with x = 0, 0.15, 0.20, and 0.30. Spin-density-wave (SDW) order is observed in the undoped and the least doped samples with x = 0 and 0.15 at TSDW = 191 and 131 K, respectively. For x = 0.15 and 0.20 Eu(Fe_1\ensuremath-xCox)2As2 becomes a superconductor with Tconset = 20.5 and 8.5 K, respectively. We find properties of the SDW state in the parent EuFe2As2 compound well described by the Dirac-fermions model. On the other hand, the small cobalt doping significantly changes the transport coefficients below TSDW in Eu(Fe0.85Co0.15)2As2. Further increasing of x causes an evolution of the system toward a regular metallic state. The antiferromagnetic ordering of the Eu2+ ions at TN\ensuremath≈ 18 K has only minor influence on the measured quantities.