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MA: Fachverband Magnetismus

MA 13: Magnetic Heuslers and Semiconductors

MA 13.9: Vortrag

Montag, 9. März 2026, 17:00–17:15, POT/0361

Pressure-dependence of the thermoelectric properties of MnIn₂Te₄ — •Shubham Rakesh Singh, Mohammed Ghadiyali, and Udo Schwingenschlögl — Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia

We investigate the thermoelectric properties of MnIn₂Te₄ in its two experimentally characterized phases. The tetragonal phase (I42m) undergoes a pressure-induced transition to an orthorhombic phase (Pnma) at 1.3 GPa. First-principles calculations reveal for both phases a small energy difference between antiferromagnetic and ferromagnetic states. The band gap is 1.04 (0.70) eV in the tetragonal phase and 1.25 (1.10) eV in the orthorhombic phase for the antiferromagnetic (ferromagnetic) state. A higher power factor is achieved by n-type than by p-type carriers. At 700 K, for example, the more densely packed orthorhombic phase exhibits a 56% reduction in the lattice thermal conductivity as compared with the tetragonal phase, yielding high thermoelectric figures of merit of 1.23 for n-type carriers and 0.96 for p-type carriers at optimal carrier concentration.

Keywords: Antiferromagnetic–ferromagnetic states; Thermoelectric properties; Pressure-induced phase transition; MnIn2Te4; Lattice thermal conductivity