Magnetic structure of EuFe2As2 determined by single crystal neutron diffraction - Condensed Matter > SuperconductivityReport as inadecuate




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Abstract: Among various parent compounds of iron pnictide superconductors, EuFe2As2stands out due to the presence of both spin density wave of Fe andantiferromagnetic ordering AFM of the localized Eu2+ moment. Single crystalneutron diffraction studies have been carried out to determine the magneticstructure of this compound and to investigate the coupling of two magneticsublattices. Long range AFM ordering of Fe and Eu spins was observed below 190K and 19 K, respectively. The ordering of Fe2+ moments is associated with thewave vector k = 1,0,1 and it takes place at the same temperature as thetetragonal to orthorhombic structural phase transition, which indicates thestrong coupling between structural and magnetic components. The ordering of Eumoment is associated with the wave vector k = 0,0,1. While both Fe and Euspins are aligned along the long a axis as experimentally determined, ourstudies suggest a weak coupling between the Fe and Eu magnetism.



Author: Y. Xiao, Y. Su, M. Meven, R. Mittal, C.M.N. Kumar, T. Chatterji, S. Price, J. Persson, N. Kumar, S. K. Dhar, A. Thamizhavel, Th.

Source: https://arxiv.org/







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