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Magnetic structure of the topological semimetal YbMnSb2

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Soh Jian-Rui, Tobin Siobhan M., Su Hao, Zivkovic Ivica, Ouladdiaf Bachir, Stunault Anne, Rodríguez-Velamazán J. Alberto, Beauvois Ketty, Guo Yanfeng, Boothroyd Andrew T.,
Project Versatile high sensitivity and throughput magnetometer for quantum, functional and applied materials
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 104(16)
Page(s) L161103 - L161103
Title of proceedings Physical Review B
DOI 10.1103/physrevb.104.l161103

Open Access

URL https://journals.aps.org/prb/abstract/10.1103/PhysRevB.104.L161103
Type of Open Access Publisher (Gold Open Access)

Abstract

The antiferromagnetic (AFM) semimetal YbMnSb2 has recently been identified as a candidate topological material, driven by time-reversal symmetry breaking. Depending on the ordered arrangement of Mn spins below the Néel temperature, TN=345K, the electronic bands near the Fermi energy can either have a Dirac node, a Weyl node, or a nodal line. We have investigated the ground state magnetic structure of YbMnSb2 using unpolarized and polarized single crystal neutron diffraction. We find that the Mn moments lie along the c axis of the P4/nmm space group and are arranged in a C-type AFM structure, which implies the existence of gapped Dirac nodes near the Fermi level. The results highlight how different magnetic structures can critically affect the topological nature of fermions in semimetals.
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