Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Poster Magnetism I

MA 7.57: Poster

Montag, 9. März 2026, 09:30–12:30, P2

Possibility for altermagnetic to antiferromagnetic phase transition in LaTiO₃ — •Igor Maznichenko and Samir Lounis — Institute of Physics, Martin Luther University Halle-Wittenberg, D-06099 Halle, Germany

Here we investigate and compare the electronic band structure of altermagnetic and antiferromagnetic phases in Mott insulator LaTiO₃ [1]. Using ab initio calculations, we have found a stable altermagnetic phase with the G-type arrangement. In LaTiO₃, triple-degenerated cubic Ti t_2g orbitals are occupied by only one electron, the semiconducting band gap separates the occupied Ti t_2g¹ e_g⁰ subband from the unoccupied conduction band edge, while the f states of La appear at much higher energies. The key structural factor of Pbnm-LaTiO₃, which determines its band gap and zero magnetization, is optimally rotated TiO₆. Using simulations of disorder for these Ti t_2g orbitals, we demonstrate the fragility of the altermagnetic phase with multiorbital effects.

[1] I.V.Maznichenko et al, Phys. Rev. Materials 8, 064403 (2024).

Keywords: Altermagnet; LaTiO3; Mott insulator; orbital disordering; magnetic phase transition