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Discovery of topological nodal-line fermionic phase in a magnetic material GdSbTe
Hosen, MM Dhakal, G Dimitri, K Maldonado, P Aperis, A Kabir, F Sims, C Riseborough, P Oppeneer, PM Kaczorowski, D
Hosen, MM
Dhakal, G
Dimitri, K
Maldonado, P
Aperis, A
Kabir, F
Sims, C
Riseborough, P
Oppeneer, PM
Kaczorowski, D
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Journal Article
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2018-12-01
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10.1038/s41598-018-31296-7
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© 2018, The Author(s). Topological Dirac semimetals with accidental band touching between conduction and valence bands protected by time reversal and inversion symmetry are at the frontier of modern condensed matter research. A majority of discovered topological semimetals are nonmagnetic and conserve time reversal symmetry. Here we report the experimental discovery of an antiferromagnetic topological nodal-line semimetallic state in GdSbTe using angle-resolved photoemission spectroscopy. Our systematic study reveals the detailed electronic structure of the paramagnetic state of antiferromagnetic GdSbTe. We observe the presence of multiple Fermi surface pockets including a diamond-shape, and small circular pockets around the zone center and high symmetry X points of the Brillouin zone (BZ), respectively. Furthermore, we observe the presence of a Dirac-like state at the X point of the BZ and the effect of magnetism along the nodal-line direction. Interestingly, our experimental data show a robust Dirac-like state both below and above the magnetic transition temperature (TN = 13 K). Having a relatively high transition temperature, GdSbTe provides an archetypical platform to study the interaction between magnetism and topological states of matter.
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Scientific Reports
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