Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Magnetic textures II

MA 51.4: Vortrag

Donnerstag, 15. März 2018, 15:45–16:00, EB 407

Thermal expansion and Hall effect of Mn₃ZnN-based non-collinear antiferromagnets — •Sihao Deng^{1, 2}, Cong Wang³, Gerda Fischer¹, Qingzhen Huang⁴, Sasmita Srichandan¹, and Christoph Sürgers¹ — ¹Physikalisches Institut, Karlsruhe Institute of Technology, Karlsruhe, Germany — ²Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory, SWUST, Mianyang, China — ³Dept. of Physics, Beihang University, Beijing, China — ⁴NIST Center for Neutron Research, NIST, Gaithersburg, USA

Antiferromagnetic Mn₃ZnN-based antiperovskites show a number of interesting magnetic properties due to a non-collinear arrangement of magnetic moments. We investigate the thermal expansion and the magneto-electronic behavior of polycrystalline Mn₃Zn_0.77Mn_0.19N_0.94, Mn₃Zn_0.83Mn_0.15N_0.99, and Mn₃Zn_0.5Ge_0.5N. Neutron diffraction performed between 5 and 300 K reveals the existence of a triangular non-collinear antiferromagnetic phase below the Neel temperature T_N in these compounds [1, 2]. This magnetic phase with strong spin-lattice coupling gives rise to a zero thermal expansion behavior observed for these compounds. Furthermore, we investigate the Hall effect for temperatures down to 2 K. For Mn₃Zn_0.5Ge_0.5N, we observe a change of the Hall effect at low temperatures, presumably caused by a structural distortion and the accompanied modification of the magnetic texture with a non-coplanar component.

[1] S. Deng, et al., Script. Mater. 146, 18 (2018)

[2] S. Deng, et al., J. Phys. Chem. C 119, 24983 (2015)