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Phase Diagram of Eu Magnetic Ordering in Eu(Fe1−xCox )2As2 Single Crystals

This member of the pnictide family shows a broad variety of magnetic and superconducting features. Especially the interplay of the Eu and Fe magnetic sublattices in combination with various Co content requires detailed studies with single crystal neutron diffraction. Using the short wavelengths of HEiDi to overcome the strong Eu neutron absorption in these compounds HEiDi contributed to various studies on this family of compounds.

The ground-state magnetic structure of the Eu2+ spins is found to develop from the A-type antiferromagnetic (AFM) order in the parent compound, via the A-type canted AFM structure with some net ferromagnetic (FM) moment component along the crystallographic c  direction at intermediate Co doping levels, finally to the pure FM order at relatively high Co doping levels.

Phase diagram of Sn-flux-grown Eu(Fe1−xCox )2As2 single crystalsThe phase diagram of Sn-flux-grown Eu(Fe1−xCox )2As2 single crystals, illustrating the evolution of the magnetic ground state of the Eu2+ spins with Co doping. TC(x) is assumed to vary linearly as TN(x) does.
Copyright: Forschungszentrum Jülich

References:

  1. W. T. Jin, Y. Xiao, Z. Bukowski, Y. Su, S. Nandi, A. P. Sazonov, M. Meven, O. Zaharko, S. Demirdis, K. Nemkovski, K. Schmalzl, L. Tran, Z. Guguchia, E. Feng, Z. Fu, and Th. Brückel, Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1-xCox)2As2 single crystals, Phys. Rev. B 94, 184513 (2016)

Contact: 

Shibabrata Nandi
Phone:   +49 2461 61-4762 
email: s.nandi@fz-juelich.de

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Contact: 

Yixi Su
Phone:   +49 89 289-10714 
email: y.su@fz-juelich.de

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Contact: 

Martin Meven
Phone:  +49 89 289 14727 
email: martin.meven@frm2.tum.de

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