Magnetic structures and the Ce-Fe coupling induced Fe spin reorientation in CeFeAsO single crystal

Abstract

Neutron and synchrotron resonant X-ray magnetic scattering (RXMS) complemented by heat capacity and resistivity measurements reveal the evolution of the magnetic structures of Fe and Ce sublattices in single crystal CeFeAsO. The RXMS of magnetic reflections at the Ce $L_{\mathrm{II}}$-edge shows a magnetic transition that is specific to the Ce antiferromagnetic long-range ordering at $T_{\text{Ce}}\approx$ 4 K with short-range Ce ordering above $T_{\text{Ce}}$, whereas neutron diffraction measurements of a few magnetic reflections indicate a transition at $T^{\ast }\approx$ 12 K with unusual order parameter. Detailed order parameter measurements on several magnetic reflections by neutrons show a weak anomaly at 4 K which we associate with the Ce ordering. The successive transitions at $T_{\text{Ce}}$ and $T^{\ast }$ can also be clearly identified by two anomalies in heat capacity and resistivity measurements. The higher transition temperature at $T^{\ast }\approx$ 12 K is mainly ascribed to Fe spin reorientation transition, below which Fe spins rotate uniformly and gradually in the \textit{ab} plane. The Fe spin reorientation transition and short-range Ce ordering above $T_{\text{Ce}}$ reflect the strong Fe-Ce couplings prior to long-range ordering of the Ce. The evolution of the intricate magnetic structures in CeFeAsO going through $T^{\ast }$ and $T_{\text{Ce}}$ is proposed.

10 pages, 11 figures, Physical Review B, in press

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• Enhanced magnetocaloric effect and magnetic phase diagrams of single-crystal GdCrO${}_3$
• Spin reorientation and Ce-Mn coupling in antiferromagnetic oxypnictide CeMnAsO
• Structure and magnetic properties of {\it Ln}MnSbO ({\it Ln} = La and Ce) and CeMnAsO
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• Impact of the various spin and orbital ordering processes on multiferroic properties of orthovanadate DyVO3
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• Spin reorientation of the Fe moments in Eu${}_{0.5}$Ca${}_{0.5}$Fe${}_2$As${}_2$: Evidence for a strong interplay of Eu and Fe magnetism
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