Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Poster I
MA 15.48: Poster
Tuesday, March 18, 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 TNCr = 157.9 K. At a lower temperature (below TNTb ∼ 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