EuFe_2As_2 magnetic structure determination

Javier Herrero-Martin (1) , Valerio Scagnoli (1) , Claudio Mazzoli (1) , Yixi Su (2) , Ranjal Mittal (2, 3) , Y. Xiao (4) , Th. Brückel (2, 4) , Neeraj Kumar (5) , S. K. Dhar (5) , A. Thamizhavel (5) , Luigi Paolasini (1)

1 ESRF - European Synchrotron Radiation Facility
2 Juelich Centre for Neutron Science
3 BARC - Bhabha Atomic Research Centre
4 Institut für Festkörperforschung
5 CMPMS - Department of Condensed Matter Physics and Materials Science [TIFR]

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

Mots clés: iron pnictides; antiferromagnetism; magnetic X ray scattering; RXS

Domaines: Electrons fortement corrélés [cond-mat.str-el]

Javier Herrero-Martin, Valerio Scagnoli, Claudio Mazzoli, Yixi Su, Ranjal Mittal, et al.. EuFe_2As_2 magnetic structure determination. 2009. ⟨hal-00392528v3⟩