Magnetic-field-induced nontrivial electronic state in the Kondo-lattice semimetal CeSb

Y. Fang, F. Tang, Y. R. Ruan, J. M. Zhang, H. Zhang, H. Gu, W. Y. Zhao, Z. D. Han, W. Tian, B. Qian, X. F. Jiang, X. M. Zhang, X. Ke

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17 Scopus citations

Abstract

Synergic effect of electronic correlation and spin-orbit coupling is an emerging topic in topological materials. Central to this rapidly developing area are the prototypes of strongly correlated heavy-fermion systems. Recently, some Ce-based compounds are proposed to host intriguing topological nature, among which the electronic properties of CeSb are still under debate. In this paper, we report a comprehensive study combining magnetic and electronic transport measurements, and electronic band-structure calculations of this compound to identify its topological nature. Quantum oscillations are clearly observed in both magnetization and magnetoresistance at high fields, from which one pocket with a nontrivial Berry phase is recognized. Angular-dependent magnetoresistance shows that this pocket is elongated in nature and corresponds to the electron pocket as observed in LaBi. Nontrivial electronic structure of CeSb is further confirmed by first-principle calculations, which arises from spin splitting in the fully polarized ferromagnetic state. These features indicate that magnetic field can induce nontrivial topological electronic states in this prototypical Kondo semimetal.

Original languageEnglish
Article number094424
JournalPhysical Review B
Volume101
Issue number9
DOIs
StatePublished - Mar 1 2020

Funding

This work is supported by the National Natural Science Foundation of China (Grants No. 11604027, No. 11874113, and No. U1832147), Key University Science Research Project of Jiangsu Province of China (Grant No. 19KJA530003), Natural Science Foundations of Fujian Province of China (Grant No. 2017J06001), Open Fund of Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials (Grant No. QMNEM1903). Work at Michigan State University was supported by the National Science Foundation under Award No. DMR-1608752 and the start-up funds from Michigan State University. A portion of this research used resources at the High Flux Isotope Reactor, a Department of Energy Office of Science User Facility operated by the Oak Ridge National Laboratory.

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