Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 5: Heusler compounds, semimetals and oxides (joint session MA/TT)

MA 5.6: Talk

Monday, March 12, 2018, 10:45–11:00, EB 301

Electrical transport in the tetragonal Heusler system Mn-Pt-Ga — •Vivek Kumar¹, Ajaya K. Nayak², Nitesh Kumar¹, Peter Adler¹, and Claudia Felser¹ — ¹Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ²National Institute of Science Education and Research Bhubaneswar, Jatni, India

Nontrivial magnetic textures have attracted interest for improving desired properties in spintronic devices. Materials with non-centrosymmetric crystal structure are capable of inducing nontrivial spin structures due to the presence of Dzyaloshinskii-Moriya interaction (DMI). We have recently reported the magnetic antiskyrmions in tetragonal Heusler material Mn_1.4Pt_0.9Pd_0.1Sn [1]. Here, we present the effect of spin-orbit interaction in another inverse tetragonal Heusler system Mn-Pt-Ga by electrical transport measurements. The tetragonal Mn₃Ga has ferrimagnetic order where Mn atoms sit on two different magnetic sublattices. The substitution of a late transition metal in place of Mn, here Pt, leads to breaking the inversion symmetry [2]. We found an anomaly in Hall resistivity which is dominating at higher Pt substitution. The behavior of Hall resistivity cannot be scaled with magnetization. This is an indication of non-coplaner spin configurations in this system which are stabilized due to increase in DMI.
[1]A. K. Nayak et al., Nature 548, 561 (2017).
[2]S. Chadov et al., Phys. Rev. B 91, 094203 (2015).