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29 March 2024
 
  » arxiv » 1107.2103

 Article overview


Study of the anisotropic magnetic order of the Eu sublattice in single crystals of EuFe_2-xCo_xAs_2 (x = 0, 0.2) by means of magnetization and magnetic torque
Z. Guguchia ; S. Bosma ; S. Weyeneth ; A. Shengelaya ; R. Puzniak ; Z. Bukowski ; J. Karpinski ; H. Keller ;
Date 11 Jul 2011
AbstractHere, we present a combination of magnetization and magnetic torque experiments to investigate the magnetic orders in undoped EuFe2As2 and Co doped EuFe1.8Co0.2As2 single crystals. Although at low temperatures typical results for an antiferromagnetic (AFM) state in EuFe2As2 were found, our data strongly indicate the occurrence of a canted antiferromagnetic (C-AFM) order of the Eu2+ moments between 17 K and 19 K, observed even in the lowest studied magnetic ?elds. However, unlike in the parent compound, no low-?eld and low-temperature AFM state of the Eu^2+ moments was observed in the doped EuFe1.8Co0.2As2. Only a C-AFM phase is present at low ?elds and low temperatures, with a reduced magnetic anisotropy as compared to the undoped system. We present and discuss for both, EuFe2As2 and EuFe1.8Co0.2As2, the experimentally deduced magnetic phase diagrams of the magnetic ordering of the Eu^2+ sublattice with respect to the temperature, the applied magnetic ?eld, and its orientation to the crystallographic axes. It is likely that the magnetic coupling of the Eu and the Fe sublattice is strongly depending on Co doping, having detrimental in uence on the magnetic phase diagrams as determined in this work. Their impact on the occurrence of superconductivity with higher Co doping is discussed.
Source arXiv, 1107.2103
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