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MA: Fachverband Magnetismus

MA 15: Poster I

MA 15.48: Poster

Dienstag, 18. März 2025, 10:00–12:30, P1

Revealing rich magnetic phases and novel spin-wave spectra in Orthorhombic perovskite TbCrO3: a frsfprinciples study — •Fengyi Zhou — Faculty of Applied Sciences, Macao Polytechnic University, Macao SAR, 999078, China

The experimental measurements have revealed the orthohombic perovskite TbCrO₃ crystal exhibits rich magnetic structures with temperature variation. Specifically, a long-range canted AFM state of Cr³⁺ ions is formed below T_N^Cr = 157.9 K. At a lower temperature (below T_N^Tb ∼ 7.7 K), the Tb³⁺ ions exists a long-range antiferromagnetic (AFM) order. Furthermore, a weak competition between the FM and AFM interactions within the Cr³⁺ ions is observed at 15 K. Importantly, a strong coupling between the spin orders of the Cr³⁺ and Tb³⁺ ions is observed at 1.8 K. As the temperature decreases, the magnetic moment of Tb disappears first. Currently, in-depth theoretic research is appealing and urgently needed to explore these complex magnetic interactions, magnetic phase transition and spin wave spectra of TbCrO₃.

Based on the first-principles study, this study presents the entire magnetic landscape of TbCrO₃ including the magnetic ground state, equilibrium state, and excited state. Meanwhile, we clarified the detailed magnetic exchange mechanisms including the isotropic Heisenberg exchange and the antisymmetric Dzyaloshinskii-Moriya interaction, as well as single ion anisotropy. Finally, the spin wave spectrum considered adiabatic and temperature-dependent relationships is also evaluated.

Keywords: Orthorhombic perovskite TbCrO$_3$; First-principles study; magnetic exchange mechanism; spin wave spectrum; Magnetic phase diagram