High-entropy engineering of the crystal and electronic structures in a Dirac material

Antu Laha, Suguru Yoshida (), Francisco Marques dos Santos Vieira, Hemian Yi, Seng Huat Lee, Sai Venkata Gayathri Ayyagari, Yingdong Guan, Lujin Min, Jose Gonzalez Jimenez, Leixin Miao, David Graf, Saugata Sarker, Weiwei Xie, Nasim Alem, Venkatraman Gopalan, Cui-Zu Chang, Ismaila Dabo () and Zhiqiang Mao ()
Additional contact information
Antu Laha: Pennsylvania State University
Suguru Yoshida: Pennsylvania State University
Francisco Marques dos Santos Vieira: Pennsylvania State University
Hemian Yi: Pennsylvania State University
Seng Huat Lee: Pennsylvania State University
Sai Venkata Gayathri Ayyagari: Pennsylvania State University
Yingdong Guan: Pennsylvania State University
Lujin Min: Pennsylvania State University
Jose Gonzalez Jimenez: Michigan State University
Leixin Miao: Pennsylvania State University
David Graf: National High Magnetic Field Laboratory
Saugata Sarker: Pennsylvania State University
Weiwei Xie: Michigan State University
Nasim Alem: Pennsylvania State University
Venkatraman Gopalan: Pennsylvania State University
Cui-Zu Chang: Pennsylvania State University
Ismaila Dabo: Pennsylvania State University
Zhiqiang Mao: Pennsylvania State University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Dirac and Weyl semimetals are a central topic of contemporary condensed matter physics, and the discovery of new compounds with Dirac/Weyl electronic states is crucial to the advancement of topological materials and quantum technologies. Here we show a widely applicable strategy that uses high configuration entropy to engineer relativistic electronic states. We take the AMnSb2 (A = Ba, Sr, Ca, Eu, and Yb) Dirac material family as an example and demonstrate that mixing of Ba, Sr, Ca, Eu and Yb at the A site generates the compound (Ba0.38Sr0.14Ca0.16Eu0.16Yb0.16)MnSb2 (denoted as A5MnSb2), giving access to a polar structure with a space group that is not present in any of the parent compounds. A5MnSb2 is an entropy-stabilized phase that preserves its linear band dispersion despite considerable lattice disorder. Although both A5MnSb2 and AMnSb2 have quasi-two-dimensional crystal structures, the two-dimensional Dirac states in the pristine AMnSb2 evolve into a highly anisotropic quasi-three-dimensional Dirac state triggered by local structure distortions in the high-entropy phase, which is revealed by Shubnikov–de Haas oscillations measurements.

Date: 2024
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DOI: 10.1038/s41467-024-47781-9

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