Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

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

TT 6.9: Vortrag

Montag, 16. März 2020, 11:30–11:45, HSZ 401

Magnetic structures and interplay between Eu and Mn in Dirac material EuMnBi2 — •Fengfeng Zhu1, Xiao Wang1, Junda Song1, Thomas Müller1, 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

We report here a comprehensive determination of the antiferromagnetic (AFM) structures of Eu and Mn magnetic sub-lattices by using both polarized and non-polarized single-crystal neutron diffraction methods. All the magnetic moments are orientated along c axis, the magnetic propagation vector is (0,0,1) for Eu sub-lattice and (0,0,0) for Mn sub-lattice. With proper neutron absorption correction, the ordered moments are refined as about 7.7 µB and 4.1 µB for the Eu and Mn ions, respectively, at 3K. In addition, a spin-flop phase transition of Eu moments was confirmed at field Bc ∼5.3T along c axis which is constant with previous reported work [1] and the evolution of magnetic moment orientations were also determined. In the spin-flop process, we found a clear kink in the field dependence of magnetic diffraction (1,0,1) of Mn, which unambiguously indicates the existence of strong coupling between Eu and Mn moments [2].

[1] H. Masuda et al., Sci. Adv. 2, e1501117 (2016) [2] A. F. May et al., Phys. Rev. B 90, 075109 (2014)

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