EuFe_2As_2 magnetic structure determination
Javier Herrero-Martin (ESRF), Valerio Scagnoli (ESRF), Claudio Mazzoli, (ESRF), Yixi Su, Ranjal Mittal, Y. Xiao, Th. Br\"uckel, Neeraj Kumar, S. K., Dhar, A. Thamizhavel, Luigi Paolasini (ESRF)
TL;DR
This study uses magnetic resonant X-ray scattering to determine the magnetic structure of EuFe_2As_2, revealing Eu and Fe moments align along the a-axis, with minimal interaction between their magnetic phases.
Contribution
First determination of Eu magnetic moment orientation in EuFe_2As_2 using resonant X-ray scattering, clarifying magnetic ordering in this compound.
Findings
Eu magnetic moments align along the a-axis below 19 K
Fe magnetic moments also align along the a-axis in the spin density wave phase
Eu magnetic ordering has little effect on Fe magnetic sublattice
Abstract
Magnetic resonant X ray scattering experiments have been performed on a single crystal of EuFe_2As_2 at the Eu L_3 absorption edge. This has permitted us to determine for the first time the orientation of Eu magnetic moments in the antiferromagnetic ordered phase below T_N=19 K as parallel to the a-axis. In addition, non-resonant magnetic X ray measurements indicate that Fe magnetic moments align along the same direction in the spin density wave phase (T<T_S~190 K). Temperature dependences indicate that the onset of the Eu AFM phase barely affects the Fe magnetic sublattice.
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Taxonomy
TopicsMagnetic Properties of Alloys · Rare-earth and actinide compounds · Iron-based superconductors research