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Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb2

MPS-Authors
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Kumar,  Nitesh
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Yao,  Mengyu
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Nayak,  Jayita
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Bannies,  Jörn
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Müchler,  Lukas
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Shi,  Wujun
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Shekhar,  Chandra
Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Fink,  Jörg
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Fecher,  Gerhard H.
Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Sun,  Yan
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser,  Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kumar_Signatures.pdf
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Citation

Kumar, N., Yao, M., Nayak, J., Vergniory, M. G., Bannies, J., Wang, Z., et al. (2020). Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb2. Advanced Materials, 1906046, pp. 1-6. doi:10.1002/adma.201906046.


Cite as: http://hdl.handle.net/21.11116/0000-0005-B9D7-8
Abstract
Multifold degenerate points in the electronic structure of metals lead to exotic behaviors. These range from twofold and fourfold degenerate Weyl and Dirac points, respectively, to sixfold and eightfold degenerate points that are predicted to give rise, under modest magnetic fields or strain, to topological semimetallic behaviors. The present study shows that the nonsymmorphic compound PdSb2 hosts six-component fermions or sextuplets. Using angle-resolved photoemission spectroscopy, crossing points formed by three twofold degenerate parabolic bands are directly observed at the corner of the Brillouin zone. The group theory analysis proves that under weak spin-orbit interaction, a band inversion occurs.