Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Cooperative Phenomena and Phase Transitions (joint session MA/TT)

TT 6.8: Vortrag

Montag, 16. März 2020, 11:15–11:30, HSZ 401

Noncoplanar magnetic order induced absence of large anomalous Hall effects in Mn3Sn — •Xiao Wang1, Fengfeng Zhu1, Junda Song1, Yixi Su1, and Thomas Brückel21Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Garching, Germany — 2Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Jülich, Germany

Recent experimental realizations of large anomalous Hall effect (AHE) at room temperature[1] in the non-collinear antiferromagnet (AFM) Mn3Sn have attracted strong interests on this compound due to its potential applications in antiferromagnetic spintronics devices. We have prepared high quality Mn3Sn single crystals [2] and studied its physical properties and magnetic structure by various methods. Surprisingly, below a magnetic phase transition at  280 K, the AHE vanished completely along with the emergence of two incommensurate phases. Our further polarized neutron scattering studies show the low temperature magnetic structures are noncoplanar order. Based on the polarized analysis results, we propose several possible magnetic structure models below 280 K. Moreover, we will discuss the reason for disappearance of AHE in the low temperature noncoplanar structures with magnetic symmetry analysis[3] and scalar spin chirality theory.

[1] S. Nakatsuji, et al., Nature 527, 212 (2015). [2] N.H. Sung, et al., Appl. Phys. Lett. 112, 132406 (2018). [3] M.-T. Suzuki, et al. Phys. Rev. B 95, 094406 (2017).

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