Spin Reorientation in Antiferromagnetic Layered FePt5P

FePt5P, a substitutional variant of the anti-CeCoIn5 structure type in the space group P4/mmm, was synthesized by a high-temperature solid-state method and structurally characterized by X-ray diffraction. FePt5P contains layers of FePt12 clusters formed by magnetically active Fe and heavy Pt with strong spin-orbit coupling (SOC); the layers are separated by P atoms. The various Fe-Pt distances in FePt12 clusters generate complex magnetic orders in FePt5P. According to temperature-dependent magnetic and specific heat measurements, FePt5P shows a stripe-type antiferromagnetic order at T-N approximate to 90 K, which is also confirmed by resistivity measurements. Moreover, a spin reorientation occurs at similar to 74 and similar to 68 K in and out of the ab plane based on the specific heat measurements. The temperature-dependent neutron powder diffraction patterns demonstrate the antiferromagnetic order in FePt5P, and the spins orientate up to 58.4 degrees with respect to the c axis at 10 K. First-principles calculations of FePt5P show the band splitting at the Fermi level by strong SOC and the s-d hybridization between P and Fe/Pt electrons enhances the structural stability and affects the magnetic ordering.

Automated summary

FePt5P is a substitutional variant of the anti-CeCoIn5 structure type with complex magnetic orders, showing a stripe-type antiferromagnetic order at approximately 90 K and spin reorientation at around 74 K and 68 K. The compound exhibits structural stability enhanced by strong spin-orbit coupling and s-d hybridization between P and Fe/Pt electrons.