Study of the Magnetic Structure of Single Crystal YBaCuFeO₅ Using Inelastic Neutron and X-ray Scattering

Yu-Hui Liang^1*, Chun-Hao Lai¹, Shin-ichiro YANO², Chin-Wei Wang², Kirrily C Rule³, Dehong Yu³, Yen-Chung Lai⁴, Chao-Hung Du¹

¹Department of Physics, Tamkang University, New Taipei City, Taiwan
²Neutron Group, National Synchrotron Radiation Research Center, Hsinchu, Taiwan
³Australian Center for Neutron Scattering, Australian Nuclear Science and Technology Organization, NSW, Australia
⁴Materials Science Group, National Synchrotron Radiation Research Center, Hsinchu, Taiwan

* Presenter:Yu-Hui Liang, email:yhl050893@gms.tku.edu.tw

Using magnetization, dielectric constant on a high-quality single-crystal YBaCuFeO₅(YBCFO) with the modified floating zone growth method, we demonstrate that the crystal shows two antiferromagnetic transitions at T_N1 ∼ 455 K and T_N2 ∼ 175 K. At T_N2, the commensurate spin ordering transforms to a spiral magnetic structure with a propagation vector of (ℎ/2 𝑘/2 𝑙/2±δ), where h, k, and l are odd, and the incommensurability δ is temperature-dependent. In order to understand the dynamic behavior of the spiral magnetic ordering, we applied inelastic neutron scattering to study the spin ordering of the crystal YBCFO on the beamlines SIKA and PELICAN of ANSTO. On PELICAN, we focused on two-phase regimes, commensurate (T = 250 K) and incommensurate (T = 110 K), and observed both phases showing a very steep excitation behavior which could extend up to 5 meV. In addition, there are excitation signals between the magnetic peak have the same behavior as the magnetic one. So as to know in detail the dynamics behavior of the spiral magnetic ordering of YBCFO, we will study its electronic and magnetic structure through elastic and inelastic X-ray scattering. Also using inelastic X-ray scattering(RIXS), we observe there are two excitations of charge transfer at Fe K-edge.

Keywords: Magnetic Structure, Magnon, Charge Transfer