Magnetic structure of Nd in NdFeAsO studied by x-ray resonant magnetic scattering
Abstract
The magnetic structure of Nd in NdFeAsO compound has been investigated by x-ray resonant magnetic scattering at the Nd L2 edge (E =6.725 keV) at 1.7 ≤T ≤15 K. At T =1.7 K we find that the Nd moments are aligned along the crystallographic c direction with the (1, 0, 0) propagation vector, and are arranged antiferromagnetically along the a direction and ferromagnetically along the b and c directions. At 1.7 <T ≤15 K, we observe an unusual temperature dependence of the magnetic Bragg peaks that appear differently at Q =(h ,0 ,l ) and (0 ,k ,l ) . From the changes of magnetic intensities and our representation analysis, we find that the Nd moments are reoriented toward the a direction with a gradual decrease of the moment component in the c direction with increasing temperature. We conclude that the reorientation of the Nd moment is due to a strong interplay with the Fe moment which is fully ordered in this temperature range.
- Publication:
-
Physical Review B
- Pub Date:
- December 2019
- DOI:
- 10.1103/PhysRevB.100.224401
- Bibcode:
- 2019PhRvB.100v4401K